Can the weight of a bird be measured, considering air friction?


Why I think tension should be twice the force in a tug of war


What happens when a force is not applied on the centre of the mass?


What should we do If we wanted to increase the angular velocity of a planet?

How much energy is necessary to set a year to exactly 360 days


Can a force that has magnitude of an irrational number be exerted?

Is it possible for a physical object to have an irrational length?


What is strain? Why does DNA coil upon itself?


Faraday cage for blocking cellphone and wifi signal


If everything in the universe doubled in size overnight, would it be noticeable?


Can I levitate an object without using an electromagnet?


why is exchange force inversely proportional to square of distance?

Why are so many forces explainable using inverse squares when space is three dimensional?


How reasonable is it to suppose that we are living in a cellular automaton?


Virtual particles, what do we mean by that?

Are virtual particles only a fictive tool in equations?


Why my touchscreen doesn't respond to a pencil?

What physical properties of materials trigger the capacitive touch screen?


What happens when the source of light and distance between the slits is changed in Young's Double slit experiment

Relationship between the the slit width $w$ and source distance $d$


Why doesn't a electron stops to orbit the nucleus?

Why do electrons occupy the space around nuclei, and not collide with them?


How does relativity holds for universal speed limit?

Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?


Given Newton's third law, why are things capable of moving?


How did the big bang create space and time?


Final velocities of a two point-masses in inelastic collision


How negative velocity and negative acceleration works?

Why can velocity and acceleration be negative?


Does the speed of light change in a gravitational field?


Why didn't the big bang collapse inward into a black hole?

Given that matter cannot escape a black hole, how did the big bang produce the universe we see today?


Confusion about what exactly is meant by "Field"


Would moon fall if Earth was not rotating?

Why doesn't the Moon fall onto the Earth?


Why is a particles potential energy minimal (not zero) when the forces acting on it equal zero?

Why is the potential energy minimal when the repulsion and attraction force between molecules is 0?


Off-center propulsion of space ship : Does it travel in a straight line or rotate?


What causes force on a body in gravitationally curved space time?

How does "curved space" explain gravitational attraction?


Is the twin paradox purely a general relativistic effect?

How is the classical twin paradox resolved?


Why is quantum entanglement considered to be an active link between particles?


Why does the partial derivative with respect to $x$ of a function depending only on $\dot{x}$ vanish?

Calculus of variations -- how does it make sense to vary the position and the velocity independently?


Which forces constitute rolling friction?


Why should mass be attractive in nature?


Rigorous Mathematical Proof of the Uncertainty Principle from First Principles

Heisenberg Uncertainty Principle scientific proof


What effect would GW150914 have had over a much shorter distance?

How close would you have to be to the merger of two black holes, for the effects of gravitational waves to be detected without instruments?


What would keep a hypothetical fusion reactor from "igniting the atmosphere"?

Can open, unsafe nuclear fusion reaction burn the atmosphere?


Why do we consider current to be constant throughout a circuit?

Current in series resistors and voltage drop in parallel resistors


Why would spacetime curvature cause gravity?


Wouldn't it take an infinite amount of time to create an infinite universe?

How can something finite become infinite?


Perspective Redux (why objects seem smaller as the distance increases)

Why do objects appear smaller when farther away?


Why will two bubbles floating on water surface attract each other?


Why aren't the hottest stars mostly invisible due to radiating mostly in ultra-violet?


Don't rulers expand at the same rate as the universe they measure?

Why does space expansion not expand matter?


Book recommendations on physics of music and musical instruments


What is special about the orbitals of iron, nickel and cobalt to make them ferromagentic?

Manganese has more unpaired electrons than Iron so why is Iron ferromagnetic Manganese paramagnetic?


If I spinned a fan in a vacuum it will keep spinning forever. Why can we not make energy out of it?


Is the speed limit as light speed just based on what we see?

How does faster than light travel violate causality?


Is there an underlying reason why some forces are inversely proportional to the square of the distance?

Does Coulomb's Law, with Gauss's Law, imply the existence of only three spatial dimensions?


Active transformation and passive transformation of a scalar field


Why is the propagator the Green's function for Schrodinger equation?

Differentiating Propagator, Green's function, Correlation function, etc


In General relativity, what is the meaning of flow of $x$ momentum in $x$ direction or pressure in $x$ direction?

Layman's explanation and understanding of Einstein's field equations


Derivation of expression for sagging of a beam

Where does this formula for sagging of a beam come from?


How is Gauss' Law (integral form) arrived at from Coulomb's Law, and how is the differential form arrived at from that?


What is the derivation of the speed of light $c$ that is not based on electromagnetism?

Do all massless particles (e.g. photon, graviton, gluon) necessarily have the same speed $c$?


Why do we observe opposite motion of trees (nearer) and trees (distant) when seen from a moving frame?

Why does one get an illusion as moon following him?


Why do the electron in Bohr's principal quantum levels or ground state do not emit radiation?

Where did Schrödinger solve the radiating problem of Bohr's model?


Is there a proof from the first principle that the Lagrangian L = T - V?


Is the uncertainity principle a practical reality, a theoretical law or a measurement problem?

Isn't the uncertainty principle just non-fundamental limitations in our current technology that could be removed in a more advanced civilization?


What is the best article presenting counterarguments to a many-world interpretation?


What is the difference between photoelectric effect and Compton scattering?

Compton scattering vs. photoelectric effect


Why does coke fizz more when you add ice


Beginner question: timelessness of massless particles


What do we mean by electromagnetic charge?


When the Cosmic Microwave Background radiation cools, where does the energy go?

Redshifting of Light and the expansion of the universe


Angular Momentum Conservation Definition

Is angular momentum conserved if you move off at a Tangent?


Does pulling or pushing take more effort?


How do mirrors look & behave atomically?

Explain reflection laws at the atomic level


What does a relativistically moving capacitor "look" like?

Where's the energy in a boosted capacitor?


Does the Planck scale imply that spacetime is discrete?


How can anything ever fall into a black hole as seen from an outside observer?


What are the various physical mechanisms for energy transfer to the photon during blackbody emission?


Tension in an Atwoods machine conceptual?


Requesting some research study problems on Classical Mechanics


Is spin an observable quantity for fundamental particles?

How does one experimentally determine chirality, helicity, spin and angular momentum of a fundamental particle?


Why did the Aharonov-Bohm effect mystify people?

What is the conclusion from Aharonov-Bohm Effect?


At what speed will objects hit a singularity?

Can gravity accelerate an object past the speed of light?


Is "now" the bounding edge of the universe in the time dimension?

Does time expand with space? (or contract)


Expansion of the Universe, will light from some galaxies never reach us?

Superluminal expansion of the early universe how is this possible?


What does the speed of light have to do with mass and energy?

What is the meaning of speed of light $c$ in $E=mc^2$?


Radiation– white vs black house, hot or cool?


How does "warp drive" not violate Special Relativity causality constraints?


Why friction is zero when wheel slip is zero?

Does a tire need to slip to generate force?


What is the solution of general relativity for our universe?

How is it possible to come to a conclusion that Universe is a result of the Big Bang while we aren't able to observe the entire Universe?


Why is the field inside a hollow sphere zero?

Gravitational field intensity inside a hollow sphere


Statistical Entropy and Information theory


do quantum fields exist in superposition?


Why are mirror images flipped horizontally but not vertically?


How to calculate the force in an "impulse based reaction model"?


References for Chern-Simons action $ \int d^3 x ~\epsilon^{\mu \nu \rho} A_{\mu} \partial_{\nu} A_{\rho}$


Is there any way to read the Feynman Lectures for free?


Airfoil theory --- Why does air travel faster above?

Why does the air flow faster over the top of an airfoil?


Understanding field representation of force

Why does the density of electric field lines make sense, if there is a field line through every point?


Speed of light's relation with the expansion of the universe


Does photon have size measurement because of its particle nature


Do particles ever touch each other during a collision?

What does it mean for two objects to "touch"?


EPR-type experiments and faster-than-light communication using interference effects as signaling mechanism


What color would you see if you place 2 mirrors in opposit when one is a one way mirror


Why are there two metric signature conventions?

Advantages of using different metric signatures in relativity and QFT


What is the basic difference between absolute pressure and gauge pressure?


Gravity change as a function of time only

Radial fall in a Newtonian gravitational field


Nothing can travel faster than the speed of light. In what frame of reference?

Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?


Will an object resting on a rotating platform move in a frictionless world?


How does the sum of the series “1 + 2 + 3 + 4 + 5 + 6…” to infinity = “-1/12”?

Critical Dimension of Bosonic Strings and Regularization of $\sum_{n=1}^\infty n$


Explain difference between internal energy and enthalpy


Is everyone seeing the same color as I see?

How can you test what color different people perceive?


What is a good introductory book on quantum mechanics?


Contradiction of total energy of a system?

Kinetic energy with respect to different reference frames


How can travelling at light speed affect light itself?

If I am travelling on a car at around 60 km/h, and I shine a light, does that mean that the light is travelling faster than the speed of light?


Don't heavier objects actually fall faster because they exert their own gravity?


What physical process is the source of blackbody radiation?

What are the various physical mechanisms for energy transfer to the photon during blackbody emission?


Does chemical energy contribute to mass?

Conversion of mass to energy in chemical/nuclear reactions


How does wind cause a wind turbine to spin?

How is the kinetic energy of the wind transferred onto a lift based wind turbine?


Frequency and Wavelength peak for Wien's displaement law of a blackbody


Why is the charge naming convention wrong?


Problem in understanding Feynman's explanation of the Dirac-Delta function

Interpretation of the Dirac-measure property


Degrees of freedom in a diatomic molecule

In counting degrees of freedom of a linear molecule, why is rotation about the axis not counted?


Why do we still need to think of gravity as a force?


Einstein Field Equations and Electromagnetic Stress-Energy Tensor


differentiate between v(rms) and V(avg/dc) of an Ac signal

Why do we use Root Mean Square (RMS) values when talking about AC voltage


How gently could a comet/asteroid/meteorite “hit” Earth?


Why charges reside on the surface on conductor?

Does the induced charge on a conductor stay at the surface?


What is the time evolution operator in quantum mechanics

Why does time evolution operator have the form $U(t) = e^{-itH}$?


How do amorphous objects emit blackbody/thermal radiation?

What are the various physical mechanisms for energy transfer to the photon during blackbody emission?


How can relativistic effects be the cause of magnetic forces when the normal speeds of carrier charges are so low?

Can Maxwell's equations be derived from Coulomb's Law and Special Relativity?


What is so special about speed of light in vacuum?


Given Newton's 3rd Law, how is a sea-pumped hydro jetpack possible?


Velocity of photon when changing direction

Does light accelerate or slow down during reflection?


Action for solution of general nth order differential equation

Why are there only derivatives to the first order in the Lagrangian?


What's a good textbook to learn about waves and oscillations?


Why does the water level go down when a dense object is moved from a boat to the bottom of the pool

Basic buoyancy question: Man in a boat with a stone


why making a surface "super" smooth increases the coefficient of friction?


If time standard clocks and any memories about the time standard are destroyed, can we recover the time standard again?


What is spin as it relates to subatomic particles?


How much am I floating above the chair I am sitting on?


How can electromagnetic waves be affected by gravity if photons have no mass?


Transformers - Why more coils in second coil causes more voltage

Why do we multiply the magnetic flux by the winding number?


Loud, low-frequency "booming" sound in car

Why, when one opens 1 car window, does that noise occur?


Regarding the possibility of Closed Timelike Curves


How does quantum mechanics explain stability of electron orbitals?

Why do electrons occupy the space around nuclei, and not collide with them?


Temperature behavior over time of black or white cars in hot, sunny regions


Does black hole formation contradict the Pauli exclusion principle?


Could the LHC be used for fusion experiments?

Could we use particle colliders as fusion generators?


Will Ice Cubes Form Quicker when Made from Hot Water or Cold Water?

What is the status of Mpemba effect investigations?


The interaction between waves and particles according to their wavelength

Why does the sky change color? Why is the sky blue during the day, red during sunrise/set and black during the night?


Is Zitterbewegung an artefact of single-particle theory?


What's wrong with this experiment showing that either FTL communication is possible or complementarity doesn't hold?


Is it possible to witness a circular rainbow?


Does light or waves have any kind of mass?

Does a photon exert a gravitational pull?


Are "typical" black holes rotating or static?


Antimatter traveling back in time and gravity

Why would Antimatter behave differently via Gravity?


Why the galaxies form 2D planes (or spiral-like) instead of 3D balls (or spherical-like)?


If I kept getting closer and closer to the speed of light, what would be the gravitational effects appearing like to an observer?

If a mass moves close to the speed of light, does it turn into a black hole?


Is the age of the universe different for different people located at different points in the Universe?

Can you calculate unix timestamps (universal clock) from any planet?


What are some open problems in classical electrodynamics?

Is classical electromagnetism a dead research field?


Connection between half and whole integer eigenvalues for orbital angular momentum

Half-integer eigenvalues of orbital angular momentum


How can we prove simply that acceleration for every freely falling body is equal to $g$?

Why do two bodies of different masses fall at the same rate (in the absence of air resistance)?


How do physicists justify using $c^2$ in equations?


Double Slit Experiment: How do scientists ensure that there's only one photon?


Why can a Lorentz transformation not take $\Delta x^\mu$ to $-\Delta x^\mu$ when $\Delta x$ is time-like?

A question about causality and Quantum Field Theory from improper Lorentz transformation


What causes a force field to be "non-conservative?"


How does Newton's cradle with balls of different mass behaves?

Experimental data for asymmetric Newton cradle


Why do the derivative of the acceleration (and subsequent derivatives) not play a significant role in physics?

Why don't we consider jerk in physics classes?


A conceptual doubt regarding Forced Oscillations and Resonance


Is there a 'mechanical' explanation for the right-hand rule?

In electromagnetism, why does nature prefer the right-hand rule over the left-hand rule?


How to calculate the work without displacement?

Why does holding something up cost energy while no work is being done?


Adiabatic theorem - quantum mechanics and thermodynamics

The notion of an adiabatic process in thermodynamics -vs- quantum mechanics


Potential Difference across an ideal short circuited cell

What happens in a circuit, when the wire and the battery are superconducting. And shorted


How can spin be angular momentum and particles dimensionless?

What is spin as it relates to subatomic particles?


Can Classical Mechanics and/or Quantum Mechanics explain the formation of a single hydrogen atom?


How to sail downwind faster than the wind?


Mechanism by which a single electron moving at constant speed produces a magnetic field

Mechanism by which a moving single electron generates a magnetic field


How do you account for the fact that the field points in a particular direction when the charge density is uniform?

Gauss's law in a uniform charge distribution extending infinitely in all directions


Birds don't get electrocuted on live wire

Why do birds sitting on electric wires not get shocked?


Does increasing the tension on a string also increase the density

How does increasing the tension on a string affect the density?


What are the various physical mechanisms for energy transfer to the photon during blackbody emission?


How close do two objects have to be to considered 'in contact'?

What does it mean for two objects to "touch"?


Blandford-Znajek process: Why/how does the current flow along the magnetic field lines


Does Lorentz Invariance depend on the continuity of spacetime?

Discreteness of Spacetime and Violation of Lorentz symmetry


Is time travel possible? Is it possible to go back in time?


If two stars of mass $M$ and $2M$ move about their common centre of mass, then they have same angular velocity

Why is the period of rotation the same for two stars orbiting the same centre?


What are some good books on foundations of Thermodynamics

Recommendations for statistical mechanics book


How is pressure reduced on the upper part of an aircrafts wing?


Does mass as a measure of inertia have a meaning in zero gravity?

If there is no gravity, does that mean there's no mass as well?


Will relative velocity of light exceed $c$?

Special Relativity - two beams of light in opposite direction


Angular momentum with respect to the centre of mass


Understanding the Mathematics of Wigner function

Motivation for Wigner phase space distribution


How does increasing the distance between 2 copper plates in a circuit affect the capacitance?

The separation between the two plates of a capacitor is increased


Euler-Lagrange equations in General Relativity

Use partial or covariant derivatives when deriving equations of a field theory?


Are there any video lectures that teach Weinberg's QFT books?


Emission of EM radiation from an electron


Does invariant mass depends of temperature?

Does decrease in temperature affect mass $E=mc^2$?


Question on basic tensorial calculus on field theory

Calculus of variations -- how does it make sense to vary the position and the velocity independently?


Will gravity pull together two bodies from the other side of an empty universe?


How can a photon oscillate when it experiences no time?

Would time freeze if you could travel at the speed of light?


Does a singularity appear the instant a black hole is formed?

When does a singularity start to exist during a black hole formation?


How does time dilation occur due to velocity and gravity


If the universe is expanding, what is it expanding into?


What happens when a photon hits a mirror?


Is the general definition for black holes wrong?

What is the "Event Horizon" of a black hole


Speed of stuff falling into a black hole, beyond the event horizon

Will an object always fall at an infinite speed in a black hole?


If I turn the tip of a 100 light years long pencil, the other end instantly turns , or it takes 100 years?

Is it possible for information to be transmitted faster than light by using a rigid pole?


Can two photons form a gravitational bound state?

Are there bound states from light-light or gravity-gravity scattering in general relativity?


What is the relationship between the size of a slit and wavelength in diffraction?

Relationship between slit size and wavelength in diffraction


Is work done on a system always the negative of the work done by the system?

What is the sign of the work done on the system and by the system?


How can you use magnets to rotate a shaft, which in turn powers a generator?

What prevents this magnetic perpetuum mobile from working?


Can a macroscopic body have wavelength as that of electron?

Validity of naively computing the de Broglie wavelength of a macroscopic object


Intuition for multiple temporal dimensions


Does non-mass-energy generate a gravitational field?


What is highest temperature which is attainable?

Why is there no absolute maximum temperature?


PDE and Analysis Reference Request From Small College Grad


2d pool collision with rotational motion

How do I handle elastic contacts in a simulation with friction


To all experienced theoretical physicists out there, what is the step by step process in your math education?

How should a physics student study mathematics?


On what refractive index of medium depends ?

Why does the refractive index depend on wavelength?


Is it (theoretically) physically possible to project an image into thin air?


Trouble with classical mechanics self-learning (How to avoid going down the Physics rabbit hole?)

Recommendations for good Newtonian mechanics and kinematics books


Net acceleration felt by a body on Earth

Why don't we consider centrifugal force on a mass placed on earth?


Rolling disk in inclined plane and flat plane?

Static as opposed to Kinetic Friction in Rolling Motion


How is it possible for you to be at the centre of the universe wherever you are?


What are the ways of finding the spin of a particle

How does one experimentally determine chirality, helicity, spin and angular momentum of a fundamental particle?


How is Gauss' Law (integral form) arrived at from Coulomb's Law, and how is the differential form arrived at from that?


Math formula for crystal glass resonance


What causes refraction of visible light?

What is the mechanism behind the slowdown of light/photons in a transparent medium?


How to get "massless" equation of motion from the action of Nordstrom scalar field theory?

Derivation of equations of motion in Nordstrom's theory of scalar gravity?


Do cosmologically redshifted photons violate energy conservation?

Photons in expanding space: how is energy conserved?


Can black holes be created on a miniature scale?


How is it possible for light to be a wave and a particle?

Is the wave-particle duality a real duality?


Has the speed of light changed over time?


Should we necessarily express the dimensions of a physical quantity within square brackets?

Square bracket notation for dimensions and units: usage and conventions


Does limit $\hbar \rightarrow 0$ in Quantum Mechanics mean anything?

$\hbar \rightarrow 0$ in quantum mechanics


Is the total angular momentum of the universe zero?

What if the universe is rotating as a whole?


Why does Hawking radiation cause black holes to die?

Black holes and positive/negative-energy particles


How exactly does curved space-time describe the force of gravity?


Why isn't light scattered uniformly in every direction?

Why do Lambertian Reflectors Privilege the Observer?


How come neutrons in a nucleus don't decay?


Why is potential energy defined for only a conservative force?

What causes a force field to be "non-conservative?"


Can we observe something on just the horizon of a black hole?

How can anything ever fall into a black hole as seen from an outside observer?


Quantum Entanglement - faster than light communication


How is faster than light travel analogous to time travel?

How does faster than light travel violate causality?


Where does gravity get the energy to pull the ball?


If light was 2 parts per trillion slower than gravitational waves, would we know this from Gauss' law?

Why did the gamma ray burst from GW170817 lag two seconds behind the gravitational wave?


Why does the lake surface appear darker in some areas?


Does relativistic speed increase gravitational attraction?


Connection and curvature using differential forms

Mathematically-oriented Treatment of General Relativity


What does general relativity say about the relative velocities of objects that are far away from one another?


Effect of forces (gravitational or other) on a wheel out cycle

Why doesn't a bike/bicycle fall if going with a high speed?


Moment of inertia of a rotating black hole

Do black holes have a moment of inertia?


Does higher velocity increases the impact force?

Is there difference in force when the height increases?


How do you calculate the displacement of an object moving with a changing acceleration?

Radial fall in a Newtonian gravitational field


With the advent of General Relativity, do Newtonian Mechanics really describe the universe correctly?

What is the relation between General Relativity and Newtonian Mechanics?


Lagrangian of the Schrödinger equation: Ambiguity in legendre transformation?


Does retarded interaction of magnet and coil violate energy conservation?

Violation of energy conservation in retarded interaction of magnet and coil


Is there a known physical crystal for each space group?

How many of the 230 crystallographic groups are realized in nature?


The exact nature of electromagnetic charge

What is charge actually? How to define it?


How is momentum conserved in this example?


Why is classical electromagnetism linear?

Why is the Principle of Superposition true in EM? Does it hold more generally?


Why isn't average speed defined as the magnitude of average velocity?


How are these two definitions of angular momentum related?

Can we write $\vec L=\vec r\times \vec p$ for an extended object?


What is the maximum theoretical limit on how much a HDD can store


Is there a physical system whose phase space is the torus?


How to calculate heat generated from cosmic dust in space?

Would a fast interstellar spaceship benefit from an aerodynamic shape?


What is electron hole? Isn't it just an absence of electron?


Why electrons can't radiate in their atoms' orbits?


What is the mass density distribution of an electron?


Is the collapse of the wave function inherently time asymmetric?


Antiparticles as "holes" of the quantum fields?

Are antiparticles just particle-shaped holes?


minimum possible absolute temperature in the universe?

Lowest temperature possible in the universe?


What are the mechanics by which Time Dilation and Length Contraction occur?


Is the EmDrive, or "Relativity Drive" possible?


If gravitational radiation (or anything) cannot escape a black hole, how can it produce redshift or curve spacetime?


A thought experiment in special relativity theory

A question about special relativity theory


Can pressure in bars be equated to flow in litres per second?

Calculation of pressure from flow rate of water


Why does the speed of the Electromagnetic wave in the material depend on the frequency of the wave where as they are constant in vacuum (freespace)?

Why do prisms work (why is refraction frequency dependent)?


Is the total energy of the universe zero?


Does the order of variables matter for a quantum Lagrangian in the path integral formula for quantum mechanics?

Why path integral approach may suffer from operator ordering problem?


The role of SO(3) and SU(2) in quantum mechanics


Calculating Hubble's constant at earlier times

What is the equation for the scale factor of the universe, a(t), for the best fit of data to the $\Lambda CDM$ Model of Cosmology?


What is the difference between matter & spacetime?

Why does space expansion not expand matter?


How should semiconductors be understood?

What are "electron holes" in semiconductors?


Confused about the theoretical origin of quadratic air drag

Explanation that air drag is proportional to speed or square speed?


Why do physical bodies in the universe follow the law of physics ( or any rule/pattern ) ?

Why should a (physical) principle be applicable to different systems in different positions in space and time?


Link between Quantum and Classical Mechanics


Can a black hole be explained by newtonian gravity?


How did the universe get so big so fast?


Is the second law of thermodynamics a real law?

Is the second law of thermodynamics a fundamental law, or does it emerge from other laws?


How fast are we moving when standing still?

How fast is Earth moving through the universe?


What is the outward force on the Moon that makes it go in orbit rather that falling straight to the Earth?

Why doesn't the Moon fall onto the Earth?


Is it a problem that you can write the logarithm of a quantity with units?

What is the logarithm of a kilometer? Is it a dimensionless number?


Do Magnets ever lose their magnetism, and if so how long does it take?

How long does a permanent magnet remain a magnet?


Is work a form of energy or means of transfer of energy?


Have we observed sufficient extra-solar planetary systems to establish a planetary distribution pattern?

Are the known exoplanets representative of the population of exoplanets?


Gauss law example - Electric field and dA

Gauss law question with regard to this example


How to find the magnetic field in a toroid with time-dependent current $I(t)$?

Toroid with variable current and Ampere's Law


Gauss Law Question. Could anyone explain to me why does S3 is 0 in this lecture note example?


What will I see if launch a thing into a black hole?

Will an object always fall at an infinite speed in a black hole?


If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


What determines which frames are inertial frames?


Does the universe update time in some finite interval?


Using particle accelerators for nuclear fusion

Could we use particle colliders as fusion generators?


Why is the change in entropy greater for processes occurring at lower temperatures?

Why does heat added to a system at a lower temperature cause higher entropy increase?


Why are there only derivatives to the first order in the Lagrangian?


Do electrons emit radiation due to gravity

Does a charged particle accelerating in a gravitational field radiate?


Why is the atmosphere transparent in the visible spectrum?


How fast does gravitational information travel?


What would happen if the Earth were hollow?

Gravitational field intensity inside a hollow sphere


How do we know that fundamental constants don't slowly change in time?

What is the proof that the universal constants ($G$, $\hbar$, $\ldots$) are really constant in time and space?


Why do clouds appear only and only red at night

Why do night sky appear red when it is cloudy?


Solutions to time-independent Schrödinger's equation with symmetrical (even) potential

Time-independent Schrödinger function: If the potential $V$ is even, then the wave function $\psi$ can always be taken to be either even or odd


How do spacecraft gain kinetic energy by passing near planets?

Where does the extra kinetic energy come from in a gravitational slingshot?


Why only light nuclei are able to undergo nuclear fusion not heavy nuclei?


Variation of Hubble constant in cosmological timescales

How does the Hubble parameter change with the age of the universe?


Is spacetime flat inside a spherical shell?


Voltage difference vs number of electrons


Why there is electromagnetic resistivity $\approx 377\Omega$ in vacuum?


What's the motivation to define the unit of current as fundamental in SI system?

Why is the ampere a base unit and not the coulomb?


Why is this argument about light speed not true?

If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


Why do accelerated charges radiate energy?

How and why do accelerating charges radiate electromagnetic radiation?


Bohr' Atomic Model and Electrodynamics Confusion

Bohr's model of an atom doesn't seem to have overcome the drawback of Rutherford's model


How did the Big Bang cause the cosmos to be infinitely large?


Partial derivative of $v$ w.r.t. $x$ in Lagrangian dynamics


Why is a world line's proper time the age of an observer moving along this world line?


Angular momentum $L$ cannot be completely aligned with $z$-axis

Why can't the angular momentum vector be parallel or anti-parallel to the applied magnetic field?


Why can two (or more) electric field lines never cross?


Difference between forms of Internal energy equation

What is the difference between $Q=\Delta U+W$ and $\Delta U=Q+W$?


Why does rainwater form moving waves on the ground? Is there a name for this effect?

Why do rain waves form and what is their connection to the texture of the surface they're on?


Differences between symmetric, Hermitian, self-adjoint, and essentially self-adjoint operators


Dust patterns inside electronic product - what causes this?

Reason for strange "canyons" of dust on the cooling platform


What is the mechanism behind the slowdown of light/photons in a transparent medium?


Potential difference across a charged capacitor when an additional charge is given to its positive plate

Potential difference between two assymetrically charged plates


Why does playing a string instrument at different positions along the string cause different sounds?

Why do harmonics occur when you pluck a string?


Are vacuum fluctuations really happening all the time?


Heating a hollow disc maintaining same temperature at centre?

Will a hole cut into a metal disk expand or shrink when the disc is heated?


How can the universe by infinite when it has known start and finite time since?

What does it mean that the universe is "infinite"?


Is the Big Bang instant considered a beginning of all the coordinates of our universe?


How do photons mediate (or create) a force?


What observations would be needed to falsify the law of conservation of energy?

If conservation of energy was wrong, how would we know about it?


Is it possible to formulate a Hamiltonian for a damped system?

Lagrangian and Hamiltonian EOM with dissipative force


What are the reasons to expect that gravity should be quantized?


Why string theorist use the following result?

What areas of physics depend on the sum $1 + 2 + 3 + 4 + 5 + 6+ 7+\ldots= -1/12$?


Does a photon exert a gravitational pull?


In a circuit, if voltage is established at both terminals, then how can components use up this voltage?

Why is the voltage drop across an ideal wire zero?


How to indicate that a unit is dimensionless


Which phenomenon makes the electrons revolve around the nucleus instead of crashing into it?

Why don't electrons crash into the nuclei they "orbit"?


If I were to keep increasing the mass of particles I throw at a double slit, at what point would it stop creating an interference pattern?

How to prove wave nature of large object?


Why is gravity viewed as a curvature of spacetime and not the electromagnetic force?

Noticing that Newtonian gravity and electrostatics are equivalent, is there also a relationship between the general relativity and electrodynamics?


Why does the electric field escape a black hole?


Why oobleck does not obey Newtonian dynamics?

Why do non-Newtonian fluids go hard when having a sudden force exerted on them?


How to calculate pressure using flow rate and pipe guage

Relation between water flow and pressure


Are electrons just incompletely evaporated black holes?


How much time would it take for a free-falling ghost-like object to cross the entire Earth?

If it was possible to dig a hole that went from one side of the Earth to the other...


Is there any material that a magnetic field cannot penetrate?

Shielding magnetic field without mu-metal


What is the factor that controls the speed of electrons accelerating in vacuum?Won't they accelerate infinitely?

Accelerating particles to speeds infinitesimally close to the speed of light?


Resource commendations for SUSY gauge theory


What is the correct way to treat operators that has "time" in QM?

Time as a Hermitian operator in quantum mechanics


Why doesn't a parachutist, according to Newton, "fall" upwards (because drag is larger than gravity)?

Why when opening parachute, the man doesn't go upwards?


Quantum teleportation and no-communication theorem


Why is the sky never green?But it can be slightly blue-green?

Why is the sky never green? It can be blue or orange, and green is in between!


Classically, why is the gyromagnetic ratio always $q/2m$?

Relation between magnetic moment and angular momentum -- classic theory


Energy-momentum tensor in general relativity vs. field theory


Why the CMB has not been dispersed so far?


When motion begins, do objects go through an infinite number of position derivatives?


Why isn't temperature measured in joules per mole (J/mol)?

Why isn't temperature measured in Joules?


Prepared states and quantum entanglement

Why is quantum entanglement considered to be an active link between particles?


Problem 2.1 (c) from Quantum Mechanics (author: Eugene D. Commins)

Trace of a commutator is zero - but what about the commutator of $x$ and $p$?


If two charged bodies are connected by a string will the tension be F or 2F?(F is the force of repulsion between them)

Why I think tension should be twice the force in a tug of war


What is more dense, Neutron Star material, or Black Hole material?

What happens to atoms inside a black hole?


If photons have no acceleration, how can they have energy and momentum?

If photons have no mass, how can they have momentum?


Calculating Lagrangian of electromagnetism

Retrieving Maxwell's equations from the minimum action principle


Could dark energy just be another characteristic of the gravitational force?

Are modified theories of gravity credible?


Uncertainty principle in macroscopic world

Isn't the uncertainty principle just non-fundamental limitations in our current technology that could be removed in a more advanced civilization?


Does the recent announcement of information transmission via entanglement really indicate superluminal information transfer?

Quantum teleportation and no-communication theorem


Rubbing a balloon on a jumper and it sticks to my hair, eventually hair is uncharged, how do charges leave my hair?

How does an object regain its neutrality after being charged by rubbing?


Connection between Schrödinger equation and heat equation

How is the Schroedinger equation a wave equation?


Why does a rigid body rotates about it's centre of mass?

Why does an unhinged body rotate about its centre of mass?


How can non-infinitesimal Black holes form in finite time for a distant observer?

Can black holes form in a finite amount of time?


Is there any credible evidence for big bang?

What has been proved about the big bang, and what has not?


What voltage, in theory, should you read between the terminals if you hook a 18 volt solar panel to a 12 volt car battery?

Different batteries connected in parallel


Why are vector components themselves not vectors?

Why taking components of a component of a vector is invalid?


General Relativity and the effect of mass on time

The bigger the mass, the more time slows down. Why is this?


How much physics a mathematician needs to know to study GR?

What are the prerequisites to studying general relativity?


Why does space expansion not expand matter?


Einstein's Cosmic Speed Limit $c$ challenged by Black Holes/Massive Objects

Gravitational slingshot of light using a black hole/massive object


Why does a black hole have a finite mass?


A set of problems for "The Theoretical Minimum" Stanford course


what is the specific cause of permanent magnetism


What happens when the black hole at a galactic core eats the galaxy?

How will the super massive black hole affect our galaxy?


If light rays obey to the wave equation, why can they be thought as straight lines?


How can magnets be used to pick up pieces of metal when the force from a magnetic field does no work?


What is the simplest way to prove the Earth is round?


Why do we say that the Earth moves around the Sun?


Helping/explanatory notes for Landau&Lifschitz Physics Course

Recommendations for good Newtonian mechanics and kinematics books


Resource for nonphysicists about QM/GR incompatibility

A list of inconveniences between quantum mechanics and (general) relativity?


Why touching tooth filling with aluminum foil feels so weird?

Why do objects with different masses fall at the same rate?


Is time travel possible? Is it possible to go back in time?


Can the laws of classical mechanics be derived from quantum mechanics?

Is it possible to recover Classical Mechanics from Schrödinger's equation?


What was Albert Einstein's proof for $E=mc^2$?


Does a 27 hp engine output the same amount of energy as lifting a 1 ton stoneblock almost 3 meters per second?

Does a 27 hp engine output the same amount of energy as lifting a 1 ton stone block almost 3 meters per second?


What would stop a pendulum swinging forever in vacuum? What kind of friction is in vacuum?

Would a pendulum swing indefinitely in a frictionless vacuum?


does time exist in space or does space exist in time

What's the difference between space and time?


Huge confusion with Fermions and Bosons and how they relate to total spin of atom


What sets a "Law" apart from a "Rule" or a "Principle"?


Necessary condition for square integrable functions?

Normalizable wavefunction that does not vanish at infinity


Is the space-time deformation only a way to say how gravity works?

Does the curvature of spacetime theory assume gravity?


Is the color wheel just an optical illusion?

Why does light of high frequency appear violet?


How does my screen look to a mantis shrimp?

Is colour, as represented using primary colours, accurate only to humans?


How far from the LIGO event would we have to be to hear it?

How close would you have to be to the merger of two black holes, for the effects of gravitational waves to be detected without instruments?


How to achieve speeds faster than light?

If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


How is momentum conserved in magnetic field?

Is the canonical momentum conserved when a particle moves in magnetic field?


From where (in space-time) does Hawking radiation originate?


How does combining special relativity with quantum mechanics produce spin?


How to find tangential and normal unit vector to a trajectory from the equation?

Tangential acceleration in circular motion?


Gauge fields and strings: Loop equations


Using ion radiation to make electricity?

Is it possible to generate electric energy from the radiation of radioactive materials


What is the "single equation" in string theory that's an inch long?


Book covering differential geometry and topology for physics


Why doesn't the Moon fall onto the Earth?


Question about 3d collision of 2 particles

Determine resultant velocity of an elastic particle-particle collision in 3d space


One dimensional motion - Why does a ball fall back in my hands when I throw it up in a moving bus?

Will a ball thrown straight up in a train land in same spot (in real world)?


Does light accelerate as it nears a black hole?


Does air have a maximun supported sound intensity?


Why isn't the center of the galaxy "younger" than the outer parts?


Why is a two level laser impossible to make?


Is it possible that gravitation is not reconcilable with quantum mechanics?

Is it possible that there is no theory of quantum gravity?


Advanced methods of theoretical condensed matter

Books for Condensed Matter after Ashcroft/Mermin


Quantum mechanics textbooks that use path integrals


Max & inflection point in the principle of least action

Type of stationary point in Hamilton's principle


Why is the electric current instantaneous while the drift velocity of electrons is slow?

How is possible for current to flow so fast when charge flows so slow?


Why is there a minus in the Gauge Field Lagrangian kinetic term?

What is the origin of the factor of $-1/4$ in the Maxwell Lagrangian?


Does light in vacuum actually travel at the speed of light?

Does a photon in vacuum have a rest frame?


Why only left-handed neutrinos have been observed yet?

If the mass of neutrino is not zero, why we cannot find right-handed neutrinos and left-handed anti-neutrinos?


What is the speed of light from a star moving towards a observer.?

Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?


Linear motion with variable acceleration


What is it that makes an electron maintain a distance from the positively charged nucleus?

Why don't electrons crash into the nuclei they "orbit"?


Why does the fundamental mode of a recorder disappear when you blow harder?


How does an accelerating charge radiate electromagnetic waves?

How and why do accelerating charges radiate electromagnetic radiation?


Why do ice cubes stick together or to the edges of a drinking glass?


Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?


Why was theory of cosmic aether discarded?

The Higgs field a new Luminiferous aether?


How do you calculate the power needed to keep something stationary?

Why does holding something up cost energy while no work is being done?


What are the various physical mechanisms for energy transfer to the photon during blackbody emission?


Finding particles in the classically forbidden regions

Can a particle be physically observed inside a quantum barrier?


Is Gravity a part of the Strong Nuclear Force?

Why are the 'color-neutral' gluons confined?


where does the energy for capillary action come from?

Capillary action and conservation of energy


Undefined result of relativistic velocity addition formula


Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?

Physical dimensions for the Coulomb force in SI and CGS


Does the universe have an edge/boundary/barrier? If yes, what is at the edge?


Would a fast interstellar spaceship benefit from an aerodynamic shape?


Is there any simulation program for electrostatic and magnetostatic fields?

Where can I find simulation software for electricity and magnets?


How was Newton able to guess that gravitational force is inversely proportional to distance squared?

The distance square in the Newton's law of universal gravitation is really a square?


Why is graphene the only (stable) 2D sheet structure?

Why a mono-atomic crystal layer (2D) can't be stable?


Can time pass for a photon if it's moving in a medium?

What really causes light/photons to appear slower in media?


$\lambda=\frac{2h}{p}$ instead of $\lambda=\frac{h}{p}$?


Why does light travel at the same speed when measured by a moving observer?

Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?


How many physical degrees of freedom does the $\mathrm{SU(N)}$ Yang-Mills theory have?


How to understand the definition of vector and tensor?


Would it help if you jump inside a free falling elevator?


can we get electrical energy from gravitational energy?

Can the Earth's magnetic field be used to generate electricity?


Quantum Field Theory from a mathematical point of view


Current thinking on the reasons for 3 particle generations

Why do we think there are only three generations of fundamental particles?


Don't heavier objects actually fall faster because they exert their own gravity?


Radiation of an electron in an atom in the Rutherford model

Bohr's model of an atom doesn't seem to have overcome the drawback of Rutherford's model


Are quarks/electrons different sizes (physically/in terms of mass)?


Why electron does not lose energy in orbit when revolving around nucleus

Where did Schrödinger solve the radiating problem of Bohr's model?


Connection between spin and lorentz invariance


Why does water "act like a solid surface" when an object with large surface area hits it?

Why is jumping into water from high altitude fatal?


If dark matter only interacts with gravity, why doesn't it all clump together in a single point?


What is the buoyancy force act on an object when it's bottom is touching the ground?

How does the buoyant force on a cube at the bottom of a tank of water manifest itself?


Why do conductors moving in Earth's magnetic field not create electricity?


Is the "expansion of space" limited to intersteller space only?

Why does space expansion not expand matter?


How do spacecrafts get a gravitational boost from planets?

Where does the extra kinetic energy come from in a gravitational slingshot?


What is the difference between diffraction and interference of light?


How to derive $\int_{\Sigma}\delta(*F)\wedge\delta A =\int_{\Sigma}d\Sigma^{\mu}\delta F_{\mu\nu}\wedge\delta A^{\nu}$ for free EM?


Kinetic energy with respect to different reference frames


How is the angular momentum related to linear momentum?

Is linear monemtum conserved with in angular momentum?


Changes to centre of gravity of a moving object

Can you change the combined center of gravity (COG) of the rider and bike if you move?


Why is General Relativity considered a gauge theory?

To which extent is general relativity a gauge theory?


Is it possible that dark matter is just a bunch of gravitational waves interacting with one another?

Why people think dark matter as a massive particle? Couldn't it be gravitational waves?


Can an Object Look as Dense as a Black Hole in Special Relativity?

If a mass moves close to the speed of light, does it turn into a black hole?


What is spin as it relates to subatomic particles?


Quantum harmonic oscillator: How can we know that the lowest eigenvalue for the operator $A^{\dagger}A$ is zero and not a positive number?

Why must the eigenvalue of the number operator be an integer?


How does the solar sailing concept work?


At which speed an object becomes hotter as it travels through the air?

After what speed air friction starts to heat up an object?


Possible paradox with black holes and time dilation

How can anything ever fall into a black hole as seen from an outside observer?


What is the process that causes a collapsing star to bounce back?


I need a good book for learning mechanics in non-inertial frames


Where does the energy go when light is redshifted?


Why does a star beyond a certain mass limit (Chandrasekhar limit) only become a black hole?


What's wrong with this argument that aerodynamic lift really does rely on Bernoulli?


Coulomb's law with an $r^3$, not $r^2$, in the denominator

Why do we say that in Coulomb's law the force is proportional to $\frac{1}{r^{2}}$ and not $\frac{1}{r^{3}}$?


Why is this handle flipping back and forth?

Why does this object periodically turn itself?


If charge is carried by ions, is there a limit to the amount of charge that salt water can conduct?

Conductivity of Aqueous Ionic Solutions as a Function of Time


Why electron can not be found at some node locations in the infinite potential well?

Is there actually a 0 probability of finding an electron in an orbital node?


Why are almost every planet or star rotating?


How can i only shine/shoot one proton/electron per second?

Double Slit experiment with just one photon or electron


Do all black holes have the same mass density?

What is exactly the density of a black hole and how can it be calculated?


How can interstellar space have a temperature of 2-3K?


Why are objects at rest in motion through spacetime at the speed of light?


How does the hendo hoverboard achieve omni-directional movement?

How does Hendo hoverboards achieve the self-propelling motion? What is the MFA?


understanding time: Is time simply the rate change?


Are there any experimental data for light bending angle?


Is light moving because of self induction?

Do the electric and magnetic components of an electromagnetic wave really generate each other?


Bending of light - photon's inertia instead of mass


How to achieve vertical lift using magnets

Physics of donut magnets levitating vertically on a pencil?


Speed of light and current dimensions of the universe

How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?


Do the stellar remnant in a black hole have spatial extent?

Can we have a black hole without a singularity?


Did time exist before the Big Bang and the creation of the universe?


A question on elementary Lagrangian mechanics(perhaps a bit of maths)


Spring balance: what will be the reading?

Stretch length of horizontal and vertical springs


Can we create graviton particle or gravitational wave?

Is it possible to produce gravitational waves artificially?


If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


Can we shield a certain region of space from magnetic field?


How to project anything in medium(air) like projection in wall, as in a free medium

Is it (theoretically) physically possible to project an image into thin air?


Why don't electrons return to their ground state immediately after photoexcitation?


The implications of Gödel's Second Incompleteness Theorem on Theoretical Physics models


Did spacetime curve infinitely about 13.7 billion years ago?


Why does a circle of light appear when I shine a laser pointer at a wire?


What are the differences between special and general relativity?

What is "special" and what is "general" in Relativity?


How can a moving frame transmit energy (a fighter plane shoots a bullet)?

Is energy content of a system different depending on the observer?


Expansion of the universe in "everyday life"

Why does space expansion not expand matter?


Why does the Ricci tensor vanishes in Schwarzschild metric?

Physical meaning of non-trivial solutions of vacuum Einstein's field equations


The infinitely dense point from which the universe allegedly originated - the universe must expand, right?


Two body problem with given start positions and velocities

Kepler problem in time: how do two gravitationally attracted particles move?


Proof of weaker Baker-Campbell-Hausdorff Formula


Why does a glass acts like a mirror in viewed at an angle?

Why does a window become a mirror at night?


Would an Alcubierre drive actually allow FTL travel?

How does "warp drive" not violate Special Relativity causality constraints?


Does the spin of electrons imply a more complex structure than has been observed?

An electron has no known internal structure, does that imply it has an unknown one?


How to prove that the position operator in momentum is $i\hbar \partial/\partial p$ - One Missing Sign

Proving that $i\hbar\frac{\partial}{\partial \mathbf{p}}$ is the operator of $\mathbf{x}$ in momentum space


Why do we theorize that the Big Bang created space?


Why does an aeroplane appear to be moving slowly?

Why does a plane look like it's slower than a car?


Which is the right explanation for rocket motion?


Supermassive Black holes at centers of galaxies


How can a vector have both contra-variant and co-variant components?

Understanding the difference between co- and contra-variant vectors


What is the typical orbital life of an artificial satellite?


If you hit the light barrier what would it look like?

Would time freeze if you could travel at the speed of light?


What is the difference between conduction and convection?

What exactly is the difference between radiation, conduction, and convection?


Acting on an object at a distance faster than light, or making small cogs immovable

Is it possible for information to be transmitted faster than light by using a rigid pole?


Why doesn't the solar wind disrupt the planets?


Are there membrane theories beyond string theory?

Why one-dimensional strings, but not higher-dimensional shells/membranes?


Expanding electromagnetic field Lagrangian in terms of gauge field


Why is linear movement relative but rotation is absolute?

What is the difference between translation and rotation?


What determines the sharpness of a shadow?


What happens if electric field is not perpendicular to the magnetic field?

Is there any example where electric and magnetic fields are not perpendicular?


Can one observe a blackhole grow from outside its event horizon?

How can anything ever fall into a black hole as seen from an outside observer?


Are Newton's "laws" of motion laws or definitions of force and mass?


Do physical laws require 2nd derivatives

Why are differential equations for fields in physics of order two?


Can I determine the potential term in the Schrödinger equation based on the eigenvalues?

In quantum mechanics, given certain energy spectrum can one generate the corresponding potential?


In general relativity, is it proper to say that mass curves the three spatial dimensions and also that mass curves the fourth dimension?

In Einstein's General Relativity, do the space-time dimensions curve?


Breaking the law of conservation of energy with wormholes?

Potential energy conservation in traversable wormholes


Is angular displacement a vector? How is work defined in rotation if it isn't?

If angular velocity & angular acceleration are vectors, why not angular displacement?


Conservation of Momentum and The Expansion of The Universe

Redshifting of Light and the expansion of the universe


Why doesn't a bike/bicycle fall if going with a high speed?


Please tell me that why aren't we discarding the conventional flow of current despite not being in sync with principle of potential difference

Why is the charge naming convention wrong?


Significance of complex exponential representation of waves

What is the physical significance of the imaginary part when plane waves are represented as $e^{i(kx-\omega t)}$?


On what kind groups of Lie groups are Yang-Mills theories based?

Why is the Yang-Mills gauge group assumed compact and semi-simple?


What is the meaning of non-integer powers of physical units in electrodynamics?

What does a unit like $C^{1/5}$ or $kg^{1/2}$ physically mean?


Will a projectile fired straight up from the equator land at the same spot on the ground ignoring wind?

Earth moves how much under my feet when I jump?


Elastic potential energy of compressed spring?

What happens to the potential energy of a compressed spring when it dissolves in acid?


On the atomic level how do permanent magnets work?


Why does electric field intensity $E$ can be uniquely determined by its divergence and curl?

Do Maxwell's Equations overdetermine the electric and magnetic fields?


How do you start learning physics by yourself?


Is Veneziano amplitude able to explain the physical properties of strongly interacting hadrons (such as proton and neutron)?

Why can the Euler beta function be interpreted as a scattering amplitude?


Is there any relationship between Gravity and Electromagnetism?

Noticing that Newtonian gravity and electrostatics are equivalent, is there also a relationship between the general relativity and electrodynamics?


Remote control wireless helicopter hovering in cruising aircraft, will it move the aircraft with stability


If I travel close to the speed of light and come back, why is everyone else dead, and not me?

Why isn't the symmetric twin paradox a paradox?


Please explain me this relativistic occurrence

If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


How far away is Cosmic Background Radiation?


Are Lorentz force and maxwell's equations independent?

Can the Lorentz force expression be derived from Maxwell's equations?


Questions about gravitational and inertial mass

Understanding the different kinds of mass in gravity


Physical interpretation of $\iiint (∇\cdot\vec E)\mbox{d} V$

Can someone give an intuitive way of understanding why Gauss's law holds?


How to prove Newton's second law with quantum mechanics?

Is it possible to recover Classical Mechanics from Schrödinger's equation?


Is the total mass of the universe constant in time?

Is the total energy of the universe zero?


Are Newton's "laws" of motion laws or definitions of force and mass?


Why are so many different types of objects white, yet appear gray when they are wet?


If gravity doesn't exist,what are the implications?


Quantum mechanics potential barrier problem

Can a particle be physically observed inside a quantum barrier?


If the universe is expanding, what is it expanding into?


Book to read before "introduction to gauge field theory" by Bailin and Love

A No-Nonsense Introduction to Quantum Field Theory


Why don't photons crash into each other occasionally? Or do they?

What would the collision of two photons look like?


Does the big bang violate the conservation of energy?

Conservation law of energy and Big Bang?


Dimension & non - locality problem in string theory


Reference request for mathematical physics from an axiomatically rigorous perspective


How can I stand on the ground? EM or/and Pauli?


Why there is the requirement for derivatives no higher than second order in free quantum field equations?

Why are differential equations for fields in physics of order two?


What is the origin for the name "partition function" given to $Z = \sum e^{-\beta E_i}$?

Why is the partition function called ''partition function''?


Why does water make a paper type substances weak?

Why is paper more frangible when it is wet?


Why was an 8 TeV collider needed to find a 125 GeV Higgs?

Could LEP II have discovered a 125GeV Higgs?


What is $\Delta t$ in the time-energy uncertainty principle?


Can there be rate of change of force or rate of rate of change of force?

Is it possible to have a rate of change of acceleration?


Where is the mass and gravitational influence of dark matter?

Why doesn't dark matter affect planetary motion?


Why does the electron charge have its specific value?

Why are the anthropometric units (which are about as big as we are) as large as they are relative to their corresponding Planck units?


What does Fermi level in the band gap mean?


How do we know the precise speed of light in a vacuum?

Why does the speed of light in vacuum have no uncertainty?


Why does this planet (J1407 b) and Saturn's ring center on its equator?


What is the physical explanation of the statement "magnetic force is vector product of velocity of charged body and magnetic field"?

Is there an intuitive explanation for why Lorentz force is perpendicular to a particle's velocity and the magnetic field?


Does a solid suspended in beaker filled with Air increase the weight of the beaker?


Do Maxwell's equations predict light instantaneously reaches a point one light-year away from the source?

Deriving the speed of the propagation of a change in the Electromagnetic Field from Maxwell's Equations


How widely accepted/supported is inflation theory?

What is the evidence for Inflation of the early universe?


Contradiction in the fact that magnetic fields do zero work


The speed of the outer stars of galaxies


How do electrons move at an atomic level?

How does electricity propagate in a conductor?


What is the proof that a force applied on a rigid body will cause it to rotate around its center of mass?


How do we prove or disprove that a particle has no internal structure?

Where is the evidence that the electron is pointlike?


Conservation of momentum involved in explosions

Conservation of momentum and energy in an explosion


If a car is travelling faster than the speed of light, do the headlights still work?


How to reduce complex combination of capacitors into simpler circuits?


How does the law of conservation of energy explain magnetism?


Why don’t electrons radiate energy when in circular orbits?

Why don't electrons crash into the nuclei they "orbit"?


How is frictional force dependent on normal reaction?


Why doesn't the normal force make things move?

Given Newton's third law, why are things capable of moving?


Lorentz invariance of the Heaviside function

How to prove that orthochronous Lorentz transformations $O^+(1,3)$ form a group?


If I push my hands against each other, why does the stronger one move the weaker one if the forces should be equal and opposite


Why is the Pythagorean Theorem used for error calculation?

Why is propagation of uncertainties quadratic rather than linear?


How does it takes to deadlift a sports car?

How much force is required to lift the back of a 2,480 lb car in the air from the bumper?


What is the potential difference across a disconnected diode?


Why a wave, travelling in a lighter medium, inverts upon reflection from an interface of a denser medium?

Phase shift of 180 degrees of transversal wave on reflection from denser medium


Gravitational waves: novel or confirmatory?

Why is the detection of gravitational waves so significant?


Does the shape of a containter affect the apparent mass of liquid inside it when measured by a scale?

Does the weight of fluid in a conical container act entirely on the base?


Does a photon in vacuum have a rest frame?


Will Gödel's theorem strike a death blow to the future of science?


How physicists explained straight line propagation of Light thinking of light as wave?

If light rays obey to the wave equation, why can they be thought as straight lines?


Estimate battery's real capacity in real time

Estimating the battery capacity using current power consumption and battery percentage


If it was possible to dig a hole that went from one side of the Earth to the other...


What effect does the Moon and Sun have on gravity?

Are we slightly lighter during the day and slightly heavier at night, owing to the force of the Sun's gravity?


"Why electrons don't fall into nucleus"simple explanation needed

Why don't electrons crash into the nuclei they "orbit"?


Is the spin of an electron based on its direction of angular momentum?

What is spin as it relates to subatomic particles?


Direction of velocity and acceleration for a pendulum

The acceleration vector of a simple pendulum


Why do people rule out local hidden variables?


Why is the inner product of position eigenstates not normalised?

Normalization of basis vectors with a continuous index?


How do we know that light isn't redshifted by space itself?

Is it possible that galaxies' redshift is caused by something else than the expansion of space?


Using $\sin()$ or $\cos()$ for computing SHM?


Again, why is kinetic energy and velocity independent of position coordinates in Cartesian coordinates

Can the kinetic energy be a function of the position vector?


How was the concept of work-energy developed?

How was the formula for kinetic energy found, and who found it?


Why centripetal force does not pull the object towards the center?

Why doesn't the Moon fall onto the Earth?


Meaning of wave function which is in inside of the potential wall?

Can a particle be physically observed inside a quantum barrier?


How am I able to stand up and walk down the aisle of a flying passenger jet?


Is there any connection between theta series and physics?


Newton's third law does not apply to the kinetic energy formula?


Significance of "thin" in thin film interference

Is manufacturing roughness really the only reason we don't see optical interference in thick dielectrics like windows?


why are qubits such a game changer in quantum computing?

How are qubits better than classical bit if they collapse to a classical state after measurement?


Does the renormalisation group flow actually involve a group?

In what sense is the renormalization group equation a group?


A rotating ring on frictionless plane gets its centripetal force from?

Cause of centripetal acceleration in a ring


I would like to know why they make rockets so big


Is the normal force smaller than gravitational force due to earth's rotation?

If the ground's normal force cancels gravity, how does a person keep rotating with the Earth?


Can a particle pass through a nodal point where its wave function is zero?


Young diagrams and $\mathrm{SU}(n)$ representations

Comprehensive book on group theory for physicists?


If an astronaut orbits earth, can both Time Dilation and Gravitational Time Dilation affect it?

If an astronaut had stationed in International Space Station for the duration of mission, 17 years, would he be older?


Problem with speed of light in different material

What really causes light/photons to appear slower in media?


Does $L = I \omega$ apply for an axis not passing through the rigid body?

Angular momentum with respect to the centre of mass


Resistor circuit that isn't parallel or series


How did planets have an elliptical orbit in the first place?


Conservation of momentum contradicts the concept of potential energy

Electric Potential, Work Done by Electric Field & External Force


If pressure exerts force per unit area, does internal pressure contribute to weight of a pressure vessel

Pressure and weight? (hydrostatic paradox)


What is gravity and what causes objects to act against it?


How do we know we are not inside a black hole?


Why does relativistic Quantum mechanics make sense?

How can a particle's position be random and uncertain in quantum mechanics if it is already pre-determined in relativity?


Where does the extra kinetic energy of the rocket come from?


Any radio waves in spectrum of heat radiation?

Why does thermal radiation only occur at infrared and visible frequencies?


Which experiment would be able to detect change in the speed of light?

What is the proof that the universal constants ($G$, $\hbar$, $\ldots$) are really constant in time and space?


Why are the anthropometric units (which are about as big as we are) as large as they are relative to their corresponding Planck units?

The origin of the value of speed of light in vacuum


Are there any applications of elementary number theory to science?


Intuitively proof that intensity of a wave is proportional to the square of its amplitude

Why is energy in a wave proportional to amplitude squared?


Special relativity allows arbitrarily low travel times between two locations

How long would it take me to travel to a distant star?


Why doesn't this perpetual motion machine using magnets work?


Does Light (EM Signal) undergo accelration during reflection?

What happens when a photon hits a mirror?


Does a permanent magnet loose its magnetism?


What happens to the magnetic field in this case?


Why there is added a partial time derivative in formula for time derivative of potential energy?

What is the difference between implicit, explicit, and total time dependence, e.g. $\frac{\partial \rho}{\partial t}$ and $\frac{d \rho} {dt}$?


Different factors of $4\pi$ and $\epsilon_0$ in Poisson equation

Physical dimensions for the Coulomb force in SI and CGS


Suggest me specific book for studying scattering theory and special functions

What is a good introductory book on quantum mechanics?


Has a metric formulation of electromagnetism ever been attempted?

Geometric interpretation of Electromagnetism


Would time freeze if you could travel at the speed of light?


I still don't understand how a gas with an equation of state f(T,p,V)=0 can change if 2 state functions are fixed?


What is the current state of research about the Hayden-Preskill circuit?


Is it possible to have a perfectly black material?


Is the expansion accelerating or decelerating?

Dark Energy / Accelerating universe: naive question


Does the Higgs boson give mass to ALL other particles?


how does a lizard walk on vertical walls?


Is the universe fundamentally deterministic?


Why does Newton's Third Law not preclude any motion at all?

Given Newton's third law, why are things capable of moving?


Why do we say that light travels at a speed?


Singularity in Newton's gravitational law

Infinities in Newtons law of gravity (for point particles)


What would the properties of a particle be that would allow light to orbit it?

How close does light have to be, to orbit a perfect sphere the size and mass of Earth?


What happens to kinetic energy of an object when I stop its motion?

Where does the energy required to stop a moving body come from and go?


What is "special" and what is "general" in Relativity?


Mapping quantum states of different (quantum) physical systems to the same Hilbert space


How does the space shuttle move in a vacuum?

What is a rocket engine thrusting against in space?


How to find a condition that ensures that the rocket immediately takes off?


What does the discovery of the Higgs boson mean for SUSY?


If there was a black hole on earth, what would it look like?


Why Does Electron Revolve around nucleus?

Why don't electrons crash into the nuclei they "orbit"?


Find center of mass and moment applied on beam structure.


How to explain spin for a 14-year old teen

What is spin as it relates to subatomic particles?


What happens for a spoon if you carry it to the top of Mount Everest?


Why will this plan for a perpetual motion device not work?

The Spinning Log "Perpetual Motion" problem, and my attempt at a solution


Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?


Was there a singularity before the Big Bang or after it?

Is the Big Bang defined as before or after Inflation?


Why average incoming spins and sum over outgoing spins?

Why, in spin sums, we sum over final spin states and average over initial states?


transfer of heat from lower to higher temperature


Why does a balloon filled with air weigh more than an empty balloon

Is this kids experiment a legitimate way to show that air has mass?


Local versus global conformal groups/algebras

Difference Between Algebra of Infinitesimal Conformal Transformations & Conformal Algebra


Why is the ampere a base unit and not the coulomb?


Examples of number theory showing up in physics


Is the universe fundamentally deterministic?


Why does moving near light speed keep you young?


A good textbook on Introduction to Quantum Mechanics?

What is a good introductory book on quantum mechanics?


How does the net torque have to be 0 at all points for static equilibrium?

The choice of pivot point in non-equilibrium scenarios


How could the universe be infinite (what is meant by that)?

What does it mean that the universe is "infinite"?


If it was possible to dig a hole that went from one side of the Earth to the other...


Good book for learning about mathematical foundation of quantum physics


Did time exist before the Big Bang and the creation of the universe?


How can the orbit of Jupiter's moons be used to calculate the speed of light?

How did Rømer measure the speed of light by observing Jupiter's moons, centuries ago?


Does an object traveling near the speed of light create a gravitaional field?

Does a moving object curve space-time as its velocity increases?


What happens to a radioactive element or isotope's electrons when it undergoes alpha decay?

What Happens to electrons after Alpha Decay and Nuclear Fission?


Is there a limit to telescope resolution?

Is there a limit to the resolving power of a mirror telescope?


Observed gravity of a fast moving particle relative to observer

If a mass moves close to the speed of light, does it turn into a black hole?


How many days it takes to travel to Cygnus?

How long would it take me to travel to a distant star?


If time is relative, how could time pass?


What component of the stress–energy tensor contains the kinetic energy of heat?

Intuitive understanding of the elements in the stress-energy tensor


Which types of particles are affected by the wave-particle duality?


What is the definition of potential energy?

Why is gravitational potential energy negative, and what does that mean?


What do light wave oscillations look like?

What does a light wave look like? (3D model)


Contradictory result for scalar-field propagator from Feynman rules and LSZ formula


concerning the effects of temperature and density on the speed of sound

How can the speed of sound increase with an increase in temperature?


Are Newton's "laws" of motion laws or definitions of force and mass?


Consequences of space-expansion in the Universe


Why can I put my hand through sand but not a table?

What does it mean for two objects to "touch"?


Is Kinetic Energy stored as (rest) mass?


What makes electrons behave like particles or waves at different times?

Is the wave-particle duality a real duality?


A question about the physics involved in tracking satellites such as those used in the GPS system


Why does the Palatini formalism of GR work?

Why is it so coincident that Palatini variation of Einstein-Hilbert action will obtain an equation that connection is Levi-Civita connection?


What force causes massive objects to bend space?

Bowling ball on a rubber sheet analogy - what pulls the ball down


Shawyer EM Drive -- Momentum Conservation Violation

Is the EmDrive, or "Relativity Drive" possible?


Why doesn't dark matter affect planetary motion?


Why do cylinders roll easily and not square or rectangular slabs?

Why doesn't a block rotate due to friction?


Why do people say "finite temperature" instead of "nonzero/positive temperature"?


Kinetic energy of a photon and Schwarzschild radius


Confused about the definition of conformal transformation

Conformal transformation/ Weyl scaling are they two different things? Confused!


Topology and geometry books for particle physicists

Book covering differential geometry and topology for physics


Potential on equatorial line of a dipole is zero,while electric field is present.How?

If the electric field is the gradient of the potential, then can we say that whenever potential is zero, the electric field is zero?


Can we find a wave function for a planet orbiting the sun?

Validity of naively computing the de Broglie wavelength of a macroscopic object


Why can't quantum mechanics and general relativity be unified?

A list of inconveniences between quantum mechanics and (general) relativity?


What will happen to the entropy in a universe made out of antimatter?

Does anti-matter increase or decrease in entropy over time?


How can you tell if a given reference frame is inertial?

What determines which frames are inertial frames?


Why $(apparently)$ is the rotation of Earth not congruent/similar to Uniform Circular Motion?


Low power loss in electricity transmission lines


7 sphere, is there any physical interpretation of exotic spheres?


How do electric field lines form only open loops?

Why can't electrostatic field lines form closed loops?


How does the Higgs Boson gain mass itself?


Is two cars colliding at 50mph the same as one car colliding into a wall at 100 mph?


Electrostatic force between 2 shells. How to calculate it?

What's the exact gravitational force between spherically symmetric masses?


What is a formula for calculate muscle strength for the size?

Why are smaller animals stronger than larger ones, when considered relative to their body weight?


Why do rays exhibit mutual independence?

Why are light rays able to cross each other?


GR correction for the gravitational force

What is the weight equation through general relativity?


How to get distance when acceleration is not constant?


Introductory book on the standard model?

Books for particle physics and the Standard Model


Revolution of a rigid body about a point external to the body rotation or translation?

How is Chasles' Theorem, that any rigid displacement can be produced by translating along a line and then rotating about the same line, true?


Why does light travel in a diagonal in the time dilation experiment?


Does temperature depend on velocity of observer


The speed of light and it's variation through different media?

What really causes light/photons to appear slower in media?


How does the force on two positive point charges change when an infinite conducting plane is inserted?

Will the electrostatic force between two charges change if we place a metal plate between them?


How to check if a tensor transform a tensor?


As vehicle speed increases does the amount of friction decrease?

Does kinetic friction increase as speed increases?


What is an observer that is not a whole living human person?

What is an observer in quantum mechanics?


What actually is meant by wave nature of electron or any other material particles?


Self-contained book about complex systems and non-linear dynamics

What are some of the best books on complex systems and emergence?


What are the current experimental restrictions of the possible speeds of gravitation?

What is the status of existing measurements of the speed of gravity?


Does a constantly accelerating charged particle emit EM radiation or not?


Why is the gravitational force always attractive?


Is there any evidence that everyone sees colours the same way?

How can you test what color different people perceive?


Buzzing/Vibration in body under power lines

Cyclist's electrical tingling under power lines


Does the Planck scale imply that spacetime is discrete?


What is a good target to aim for when teaching myself quantum mechanics?

What is a good introductory book on quantum mechanics?


Recommendations for good Newtonian mechanics and kinematics books


Angular Momentum Conservation in Gravitational Interaction


Change in the width of depletion layer with doping

Effect of doping on the width of depletion layer of PN-junction diode


Is matter a continuous part of the field of space-time?


Why does the atmosphere rotate along with the earth?


The inner workings of the Olbers paradox

How can something finite become infinite?


How can we depend on the mathematical axioms that break down at the nano-level?

Why are continuum fluid mechanics accurate when constituents are discrete objects of finite size?


How does electricity 'decide' on it's pathway?

Electricity takes the path of least resistance?


How faster is the effect of force exerted by gravity?


positive charge , current and electron flow in a simple circuit …confusion

Who (and Why) started the "electrons are negative, protons are positive" convention?


Why put something in the middle of the pan would prevent soup coming out during cooking?

How can a wooden spoon be used to prevent water from over boiling?


Faster-than-light communication using Alcubierre warp drive metric around a single qubit?


If microwave ovens and WiFi both operate on the same frequency, why doesn't WiFi cook things?


Continous spectrum of black body radiation

What causes a black-body radiation curve to be continuous?


Why the electric bulb turns on almost instantly when the switch is closed?


Why current through all the resistors in series is considered to be same?

Current in series resistors and voltage drop in parallel resistors


What prevents an atom's electrons from "collapsing" onto its protons?

Why do electrons occupy the space around nuclei, and not collide with them?


What causes exactly magnets to become a permanent magnet?

Why does magnet attract iron but not other metals?


If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?


What does it mean to cancel out or reduce a noise by another noise?

Is it possible to use "negative sound waves" to "cancel out" a sound to create silence?


Time it takes two objects to collide with gravity?

The Time That 2 Masses Will Collide Due To Newtonian Gravity


Physics Equations: Integral vs Vector Derivative form

Which form of Maxwell's equations is fundamental, in integral form or differential form?


Is there a central site for accessing physics data for research?

Is there a standard resource that lists all understood particle-particle relationships?


Why is electric flux defined as $\Phi = E \cdot S$?


Why is an $RLC$ resonance curve asymmetric?

Frequency Response RLC circuit - Current against Frequency graph - Symmetry?


Invariance of a maximally entangled state under unitary operation $U \otimes U^\dagger$


How fast can the Earth spin and support life?

How fast could Earth spin and sustain life?


A conceptual doubt regarding Forced Oscillations and Resonance


Can human have a long wavelength if he moves slowly enough?

Validity of naively computing the de Broglie wavelength of a macroscopic object


Doesn't light have to be a wave since it has a wave length? (In contrast to the wave–particle duality)


What causes a hydraulic jump in flowing water?


Black holes are obvious answer to dark matter, why is that wrong?


Is this interference and if it is how is it being caused in these pictures


Why is there a mass defect in nuclear fusion?

How to explain $E=mc^2$ mass defect in fission/fusion?


Why is the detection of gravitational waves so significant?


Why do we divide the standard deviation by $\sqrt{n}$?

Multiple measurements of the same quantity - combining uncertainties


Equivalent resistance of unbalanced Wheatstone Bridge

Resistor circuit that isn't parallel or series


Can we feel weightless if Earth's angular velocity is big enough?

How fast would the Earth need to spin for us to feel weightless?


do information travels faster than light?

Extended Rigid Bodies in Special Relativity


Pinhole camera: How "How to See Without Your Glasses" works?


Energy of a photon seems to be $mv^2$, NOT $0.5mv^2$ like it should be

$\lambda=\frac{2h}{p}$ instead of $\lambda=\frac{h}{p}$?


Resolving Velocity Components in Constrained Motion


Could all the energy in all the photons in the universe account for dark matter?

How much does electromagnetic radiation contribute to dark matter?


Is there any danger of gravity being used up?

Are tidal power plants slowing down Earth's rotation?


What is cause of quantization of charge?

Theoretical reasons for charge quantization


I find there are two methods to calculate the amplitude in QFT. Is it equivalent?

Quantum Field Theory without LSZ, how is it possible?


Rate of expansion of universe during big bang


Where does mass come from in pair production?


In the LHC, how is the proton separated from the electron in the hydrogen?

How are the protons for collisions in the LHC made?


If mass increases as velocity increases, does gravity increase as well?

If a mass moves close to the speed of light, does it turn into a black hole?


Energy Conservation in Kinetic Power Plants

Why doesn't this perpetual motion machine using the buoyant force work?


Why do we say that elementary particles are pointlike?

Why do physicists believe that particles are pointlike?


Where do I begin in order to study relativity?


How does a sponge "suck" up water against gravity?


How precisely does a star collapse into a black hole?


why is there no total vacuum condition on earth?

Have we managed to make a perfect vacuum?


Does Inertial time dilation demonstrate that Time is not a dimension?


deformation and displacement by a collison?

Relationship between impact crater properties and kinetic energy?


What if--the universe is closed and very small?

Symmetrical twin paradox in a closed universe


How do electrons know which path to take in a circuit?


Practical time travel: time dilation above the event horizon

If you hover just above the event horizon of a black hole, would you see the future of the universe?


How they can estimate when the black holes collided in the recent LIGO discovery?

How were the solar masses and distance of the GW150914 merger event calculated from the signal?


A Question about Time Dilation and different observers


Kinetic Energy: Difference in energy for observers

How am I able to stand up and walk down the aisle of a flying passenger jet?


What would have been the story of the Universe if there was no mechanism to produce massive fundamental baryonic particles?

What would the universe be like if Electroweak symmetry were unbroken?


Is it possible to see an infinite distance in a vacuum, or is this prevented by dispersion?

Photons from stars--how do they fill in such large angular distances?


Is what statisticians call a "random variable" what physicists call an "observable" in QM?

Why is the application of probability in QM fundamentally different from application of probability in other areas?


Why is the Lagrangian approach preferred over the Hamiltonian approach in QFT?

Why does Quantum Field Theory use Lagrangians rather than Hamiltonians?


What are the reasons to expect that gravity should be quantized?


Lagrangian and Hamiltonian EOM with dissipative force


Does a photon in vacuum have a rest frame?


How to calculate force on impact after free fall in water

How to calculate impulse force of body hitting water?


Does a ball, when thrown into the air, ever experience an instant of rest?

How long does an object experience motionlessness at the beginning of its descent?


Pressure and weight? (hydrostatic paradox)


Does a photon exert a gravitational pull?


How much heat is needed for an atom to be ionized?


Why is there a difference in Energy required to raise the velocity of an object by one unit when it is fast than when it is slow

Why does kinetic energy increase quadratically, not linearly, with speed?


Explain why a stationary object on an inclined plane may start moving after a random time?

Why do objects sometimes fall on their own?


What keeps a bike from falling while in motion?

Why doesn't a bike/bicycle fall if going with a high speed?


What is the relation between permittivity and susceptibility of a dielectric?

What's the nuance of susceptibility and permittivity?


What speed does our cosmic system travel, relevant to a none moving system

How fast is Earth moving through the universe?


How loud is the thermal motion of air molecules?


What will a photon say about the motion of other photon?


Velocity of a falling body as a function of time AND mass

Why do two bodies of different masses fall at the same rate (in the absence of air resistance)?


Magnetic induced electric field and vice versa

Electric field lines forming closed loops


The growing expansion speed of our universe


Why circling around blackhole slows the time? In easy language

How exactly does time slow down near a black hole?


Does increasing the magnitude of the pendulum angle cause its time period to be underestimated?

Show bigger amplitude of physical pendulum means bigger period


How many significant figures should one give in stating an experimental uncertainty?

Should I round my uncertainty to nearest hundred?


What if we jump into center of the Earth?

If it was possible to dig a hole that went from one side of the Earth to the other...


Breaking of a local symmetry is impossible, so what "discrete remnant global symmetry" is the SM-Higgs breaking?

What role does "spontaneously symmetry breaking" played in the "Higgs Mechanism"?


What is the potential variation inside solid conducting sphere?


Does mass of universe at the moment of big bang changes compared to present day?

Is the total mass of the universe constant in time?


Why can't we see particle tracks in clouds or dense fog?

How come I never see cosmic rays in steam like they appear in a cloud chamber?


What is the pressure term appearing in Bernoulli's Equation?


Can you "rewind" sound messages by going supersonic?


Intuitively why time period of shm do not depend on displacement from mean position, ie. amplitude

Intuition - why does the period not depend on the amplitude in a pendulum?


Must the origin of the universe be non-physical?

Why was the universe in an extraordinarily low-entropy state right after the big bang?


Why do same/opposite electric charges repel/attract each other, respectively?


Rainbow reflected on TV screen? (pic attached)


Symmetric energy-momentum tensor using derivative wrt. metric


Paradox with Gauss' law when space is uniformly charged everywhere


Why is it harder to flip my cell phone about one axis than the other two?

Stability of rotation of a rectangular prism


Can an electron which is a bound in an atom absorb more than one photon at the same time?

Photoelectric Effect, Why can't two quanta interact with an electron at the same time?


The velocity of the flowing coming out of the balloons?


How much energy does it take to hold a bag?

Why does holding something up cost energy while no work is being done?


Why does $E = 0$ inside conducting sphere?

Why is the electric field inside a conductor zero in equilibrium?


Expansion of the Universe, will light from some galaxies never reach us?


How to calculate the kinetic energy of supernova ejecta?


Hilbert's sixth problem (current answers neglect the fact that $C_{U} \subseteq U $ )


Six particles at the corners of a regular hexagon of side $a$ move at a constant speed $v$


Does gravity get stronger with compression of matter?

Does compression of matter increase gravity?


What happens to photons under the action of gravity?


Hawking radiation (black hole evaporation)

Black holes and positive/negative-energy particles


Is the moment of inertia of the bicycle wheel relevant for keeping bicycle in the upright position?

Why doesn't a bike/bicycle fall if going with a high speed?


How can gravitions exist without violating GR?

How do gravitons impact on general relativity?


Why are transition amplitudes more fundamental than probabilities in quantum mechanics?

Why is the application of probability in QM fundamentally different from application of probability in other areas?


How to find creation and annihilation operators?

Finding the creation/annihilation operators


Is my window's semi-transparency a consequence of elementary quantum mechanics?


What does velocity relative to CMB mean?

Is the CMB rest frame special? Where does it come from?


What causes the dimensions of a star increase when its hydrogen fuel is exhausted?


Why do particles have spins such as $1/2$, $3/2$, $5/2$?

What is spin as it relates to subatomic particles?


$SO(3)$, $SU(2)$ and symmetries in quantum mechanics


Why do planets not stop revolving around the Sun?

How does Newtonian mechanics explain why orbiting objects do not fall to the object they are orbiting?


Wave Packets, Group velocity, and Phase velocity

Group Velocity and Phase Velocity of Matter Wave?


Are the ideas of the speed of light and the absolute top speed inside the universe equivalent?

Is the Speed of Light an universal spacetime constant, the velocity of electromagnetic waves, or of photons?


Would you be weightless at the center of the Earth?


After what speed air friction starts to heat up an object?


Do we feel the full force of the earths gravity even though the earth is spinning

Why don't we consider centrifugal force on a mass placed on earth?


Factor 2 in Heisenberg Uncertainty Principle: Which formula is correct?


Where to find cross section data for $e^{-}$ + $p$ $\longrightarrow$ $p$ + $e^{-}$?


Chosing a reference frame in which the Earth is at rest and doesn't rotate


Hamiltonian Noether's theorem in classical mechanics

Is there a kind of Noether's theorem for the Hamiltonian formalism?


The potential and the intensity of the gravitational field in the axis of a circular plate


The Equivalence Principle approaching the speed of light


Does gravity slow the speed that light travels?


Mathematica package for supergravity and string theory

Supersymmetry calculations using computer algebra


Mathematical proof of the Second Law of Thermodynamics

How do you prove the second law of thermodynamics from statistical mechanics?


Gravity: Why is the inverse square law exactly $1/r^2$ instead of just close to 2?

The distance square in the Newton's law of universal gravitation is really a square?


Does non-mass-energy generate a gravitational field?


How come the atmosphere moves with Earth?

Why does the atmosphere rotate along with the earth?


Uncertainty principle implies the non-deterministic universe?

Is the uncertainty principle a property of elementary particles or a result of our measurement tools?


Recommendation: Advanced topics in quantum field theory

What is a complete book for introductory quantum field theory?


Why the orbital angular momentum equal zero for electron in s state? does it mean that the electron doesn't orbiting in s

What's is the origin of Orbital Angular Momentum of electrons in atoms?


Can the lift generated by a helicopter be justified using Bernoulli theorem?


If we suddenly lost track of time, how would we know what time is now?

If time standard clocks and any memories about the time standard are destroyed, can we recover the time standard again?


Why doesn't more light bounce off of things in the manner of sound?


Archimedes' principle: innacurate terminology?

Why does a cup with 100 g water float when placed on another cup with 50 g of water?


Do atmospheric physics prevent hot air balloons from ascending over 60,000ft?


What is the moment of inertia of a cylinder about a skew axis?

Compute an object's inertia around an arbitrary axis, using its known values for the x, y and z axes


Angular momentum of a rolling sphere in relation to axis

How can angular velocity be constant even when there is a torque by friction?


LIGO Gravitational wave discovery - how did they know the cause of spike?

Are the LIGO observations proof of a black hole merger, and what happened to the black holes?


Particle with non zero acceleration with zero velocity at that instant - example

How can an object's instantaneous speed be zero and it's instantaneous acceleration be nonzero?