What is exactly gravitational potential energy and explain P.E. $= -GMm/r$?

Actual meaning of "Gravitational Potential"?


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


How can photons cause charges to attract?

Deriving the Coulomb force equation from the idea of photon exchange?


Disc Eddy current brake Torque calculation

Method of calculating eddy currents of a conductor, is this correct?


Why is the galaxy's dark matter halo a sphere instead of a disk?

Distribution of Dark Matter around galaxies


What happens when a photon hits a mirror?


Why is it so hard to mix spaghetti with meatballs?


A rope between Earth and Moon - Length and Speed of Light

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


Time Travel: Is it Possible to return to an earlier time?

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


How come an electron's wave function being nonzero at far distances doesn't mean it can travel faster than light?

How is quantum mechanics compatible with the speed of light limit?


Why do Neutrinos pass through us but photons can't pass through us?

How do neutrinos pass through the sun so quickly?


Is electric potential always differentiable?

Why do we consider potential energy function $U(x)$ differentiable?


Why is the emf over an inductor equal to that of the battery?

If induced voltage (back-emf) is equal and opposite to applied voltage, what drives the current?


What is a good thermodynamics book with problems and solutions?

Crash course in classical thermodynamics


How does the gluon field and the Higgs field interact with one another?

Is the Higgs boson not responsible for most mass?


Why does an apple fall to the ground according to GR?

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


How does a battery work and create a field inside it?

Why electrons flow through a wire connected to a battery?


What creates three dimensional wormholes?


Link between wave functions $\psi$ and state vectors $|\psi \rangle$ in quantum mechanics?

In quantum mechanics, is $|\psi\rangle$ equal to $\psi(x)$?


How to determine and distinguish between a series and a parallel connection?

Determine which circuits are parallel and which are in series


What is the difference between unit and dimensions?


How is the derivative of an operator defined?

How does one properly define the derivative of one operator-valued function?


How can the universe be homogeneous and isotropic while it has started with a big bang?


What kind of waves can be/are produced by accelerating strong /weak forces


Why is 2-terminal sensing less accurate than 4-terminal sensing if the internal resistance of leads is known?


How to prove that Weyl spinors equations are Lorentz invariant?

Regarding the Weyl spinor and its transformation properties


Why completing an octet stabilises an atom, quantum mechanically?

What is the quantum mechanical explanation of the octet rule?


Does the sun have nonzero electric charge?


Do all accelerating charge emit EM radiation?

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


Simple harmonic motion-need some clarification

Why pendulum does not follow SHM for larger angular displacement?


Quantum numbers $n$ and $\ell$ relation in many electrons atom

Why do non-hydrogen atomic orbitals have the same degeneracy structure as hydrogen orbitals?


Why is the air in high atmosphere typically colder than on the ground?


The second law of thermodynamics in terms of entropy at negative absolute temperatures

Prove that negative absolute temperatures are actually hotter than positive absolute temperatures


Why do we see an inverted image in a spoon on the concave side?

Why do we see an inverted image in a spoon when kept far from our face with concave side towards our face?


What does it mean when it is said that "General Relativity and Quantum Mechanics are incompatible"?

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


Since electron clouds of different atoms repel each other, does that mean that touch is the feeling of electromagnetic repulsion?

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


Does gravity (and all other fundamental forces, for that matter) have infinite energy as they seemingly last forever?

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


Why were the fathers of quantum mechanics so sure radioactive decay was indeterministic?


Can a spaceship increase velocity "infinitly"

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


Resistor circuit that isn't parallel or series


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


How does electric energy flow in a circuit?

How does electricity propagate in a conductor?


How Newton's third law is involved in a tug of war?

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


Do objects rotate around the torque vector or its center?


Can anybody recommend a book on quantum physics for a mathematically minded student?

A book on quantum mechanics supported by the high-level mathematics


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


Probability distribution of the decay of a single radioactive nucleus


Classical trajectories that are not a minimum of the action

Type of stationary point in Hamilton's principle


Does it mean the molecules of all matter above absolute zero temperature are moving?

Absolute zero and Heisenberg uncertainty principle


Does relativity in any way "disprove" Newton?

Did relativity make Newtonian mechanics obsolete?


Why falling camera/objects rotate and then stabilize?

Why does the video recorded by a falling, rotating camera seem to stabilize?


Where does the expression $\langle q \mid p\rangle=\frac{1}{(2\pi\hbar)^{n/2}}e^{i q\cdot p/\hbar}$ come from?

What does the Canonical Commutation Relation (CCR) tell me about the overlap between Position and Momentum bases?


How can i prove that $\frac{d\vec{p}}{dt} = \vec{F_{net}}$?

Why does $F=ma$? Is there a straightforward reason?


How to prove $\frac{\mathrm{d}^3\vec{p}}{E}$ is Lorentz invariant?


Why do electric field lines start and end at 90 degree at the surface of a conductor?

Why is the conductor an equipotential surface in electrostatics?


"Equidistant" spectra in quantum mechanics

Is the harmonic oscillator potential unique in having equally spaced discrete energy levels?


Flow Rate Calculation from a drain tank through a pipe

Calculation of pressure from flow rate of water


Suggested operatonal definition for a tensor


What would be the Slater's determinant of an excited state?

What would be the Slater's determinant representation for an excited state?


How can other 'black bodies' be compared to the oven model?

How can a cavity with perfectly reflecting walls approximate a perfectly absorbing black body?


Can we slow down light? And then travel faster than it?


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


Is it experimentally verified that the neutrinos are affected by gravity?


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


The twin paradox in a universe with a torus topology

Symmetrical twin paradox in a closed universe


Why do magnetic field lines point towards the north pole on the inside of a solenoid?

Does the direction of magnetic field in a solenoid point from north to south anywhere?


Heisenberg uncertainty principle: If a particle is totally localized, does it go faster?

Uncertainty Principle for a Totally Localized Particle


Why will crushing a water bottles keep the water in fizzy condition?

Why will crushing a partially empty 2-liter bottle keep the soda more fizzy?


Derive formula for capacity of a wrapped capacitor from geometry

Why can rolled up capacitors be modelled as flat parallel plates?


Why Pseudo/Fictious Forces act at centre of mass


Why would I feel more balanced when I ride my bike fast?

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


What is the physical reason why liquids are less compressible than gases?

Why are oxygen and hydrogen compressible, but water is barely compressible


Can the accumulation of gravitational wave energy explain Dark Energy?


Query regarding bent space-time in General Relativity

Better explanation of the common general relativity illustration (stretched sheet of fabric)


What is so special about speed of light in vacuum?


What is the origin of elements heavier than iron?


What makes quantum-entanglement communication so surprising?

Understanding quantum entanglement.. help me validate this analogy!


Quantum mechanical explanation to light slowdown in a medium

How does light speed up after coming out of a glass slab?


The second law of thermodynamics and collapse of the wavefunction?

Does the scientific community consider the Loschmidt paradox resolved? If so what is the resolution?


Why can we ignore the upper layer when computing gravity inside solid sphere?

Gravitational field intensity inside a hollow sphere


What happens to light at points of intersection?

Do laser beams interfere noticeably with each other?


Why do lines in atomic spectra have thickness? (Bohr's Model)


How do photons know they can or can't excite electrons in atoms?


With relativistic mass increase, what is velocity and distance as function of force and time?

Is there a formula that gives the position of an object depending on the time, but which doesn't allow the object to surpass the speed of light?


Does voltage drop occur with zero load and zero resistance

Voltage drop along an idealized resistance-free wire in a circuit?


What causes atoms to have their specific colors?


Is particle superposition reflected in the particle's gravitational footprint?


How can we define event to be proper and improper when there is no absolute frame of reference

What is the proper way to explain the twin paradox?


Why does frequency remain unchanged in light refraction but wavelength doesn't?

Why doesn't the frequency of light change during refraction?


Question on notation for the inner product of complex vectors


Have you ever seen in your car a mosquito? it's not capable of going 60 mph. How come it can still keep up with the car as if it weren't trying


Why does the comb attract the pieces of papers if they're neutral?


Is there any time difference when we see distant a object?

Has everything we see happened in the past?


What is the entropy of the universe today?


What is spin as it relates to subatomic particles?


length contraction in a gravitational field


Why can't classical information be transmitted through quantum entanglement by measuring time between change events?

The choice of measurement basis on one half of an entangled state affects the other half. Can this be used to communicate faster than light?


Why is there no relation between kinetic energy and momentum in collision of two bodies?

How can momentum but not energy be conserved in an inelastic collision?


Speed of light versus pull of gravity - Is $c$ really the limit?


Why is the dynamic pressure not a vector quantity?

Define Pressure at A point. Why is it a Scalar?


Space within galaxies. Is it stuck by the gravity of the galaxy or expanding and "slipping past"?

Why does space expansion not expand matter?


Falling into the black hole: a picture from the infinite distance

Does someone falling into a black hole see the end of the universe?


Transfer of angular momentum during oblique impact with(out) adhesion

How do I handle elastic contacts in a simulation with friction


QM: Why does the creation operator not have eigenstates?

Is there a simple way of finding the eigenstates of the creation and annihilation operator in QM?


Acceleration closed formula in strong gravitational field

What is the weight equation through general relativity?


If the Universe reaches the state of heat death scenario, could it produce a new Big Bang?

Dark age of universe when all fusion process ceases?


What determines color -- wavelength or frequency?


Empirical bound on sum of electron and proton charge


Why we take mean of squares in RMS Current instead of taking mean of absolute value of current?

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


How to integrate acceleration due to gravity with height?

Integrating radial free fall in Newtonian gravity


Newton's First Law of Motion; Empirical Aspects


Displacement and mass of water in a column


Distance change per time and velocity not the same is Special relativity?

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


Lagrangian, metric and geodesics: obtention of equation of motion in GR

Geodesic Equation from variation: Is the squared lagrangian equivalent?


How does melting of Antarctica's ice cause rise in sea level?

Does the sea level increase if an iceberg melts?


What is the difference in the two notation?

Difference between $\Delta$, $d$ and $\delta$


Can light continue without a light source?

Are infinite reflections between two mirrors really infinite?


If we connect a long wire to a battery, will battery produce more electrons?


How is there energy transferred when net work done is zero?

Net work done on the body when we lift it and put it on the table is zero?


In case of a charged plane metal plate can you explain by Coulomb's law how E is the same for all points around the plate?

Explanation for $E~$ not falling off at $1/r^2$ for infinite line and sheet charges?


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


Why nuclear fusion deliver energy instead of taking?

Why is the nucleus of an Iron atom so stable?


Why did Einstein put a negative sign in the Pythagorean theorem?


What decides that "it (mass energy) " is going to become mass or energy?

What keeps mass from turning into energy?


Building $\mathfrak{so}(1,3)$ reps using $\mathfrak{so}(1,3)\cong \mathfrak{su}(2)\oplus \mathfrak{su}(2)$

Vector spaces for the irreducible representations of the Lorentz Group


The two causes for the factor 2 in Coriolis effect


Why is quantum mechanical momentum the derivative of the wave function with respect to the position?


How is it the Voyagers are a few seconds closer to Earth than earlier?


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


Is it the magnetic or electric components of light that get polarized?

Why doesn't the magnetic field polarize when polarizing light?


Why can the mass of a multi-particle system be greater than or less than the sum of the masses of individual particles in that multi-particle system?


What makes the number of neutrons the number of proton similar?


Can a hovering helicopter travel half the globe in 12 hours?


Does the Planck scale imply that spacetime is discrete?


Why do we get a coloured spot on TV while dragging a bar magnet near the TV?

What causes the pattern you see when you hold a strong magnet near a CRT TV?


How to derive kinetic energy from the Lagrange equations?

Landau's argument for dependence of Lagrangian on magnitude of velocity


How is it possible to have such massive black holes?

Is there a limit as to how fast a black hole can grow?


Can electrons emit light when they are independent?

Can a free particle absorb/emit photons?


Book recommendations on geometrical methods for physicists (like Topology, Diff. Geometry)

Book covering differential geometry and topology for physics


Is there a reason why every meson and baryon has an integer electric charge?

What's the deepest reason why QCD bound states have integer charge?


Where do I begin in order to study relativity?


Is the question: 'Is our universe the inside of a black hole?' meaningful?


Is the electromagnetic spectrum bounded somehow?

What is the minimum wavelength of electromagnetic radiation?


What is a good book to self-teach optics?

Where is a good place to learn classical optics for high school competitions?


Can information be sent faster than speed of light

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


Dual nature of matter and electromagnetic radiations

Is the wave-particle duality a real duality?


Sufficient condition for square integrability

Necessary condition for square integrable functions?


Is there a limit to how hot an object can get?


Book to study Dirac delta function from a physics point of view

Resources for theory of distributions (generalized functions) for physicists


How would the Compton Effect be if an electron absorbs 100% of the energy of the incident photon?

Can a free particle absorb/emit photons?


Why does light of high frequency appear violet?


Rigorous underpinnings of infinitesimals in physics


Example of a symmetry and the group with which it is modelled?

Is there a 1-1 correspondence between symmetry and group theory?


Does energy produce a gravitational force

Does a photon exert a gravitational pull?


What is meant by negative direction of velocity?

Why and how does negative velocity exist?


Is there a travelling speed of for electric field? If yes, what is it?


Is the total energy of the universe zero?


What is the abstract idea behind energy?

How can energy be useful when it is 'abstract'?


What is dark matter? Also what is dark energy?


Why the $r$ is cubed in the vector notation for of Newton's Law of Universal Gravitation?

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


Observing starlight bending in high gravity

Bending of light - photon's inertia instead of mass


The big bang singularity and entanglement


How to measure time in presence of a strong gravitational field?


Concequences of the speed of light beeing absolute?

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?


Does the continous EM spectrum contradict discrete energy?

Why do I not see evidence of discrete energy in the spectrum?


Why do we need to have a reference temperature to define thermal coefficient of resistance (TCR)

Does the temperature coefficient of a material depend on temperature?


How to evaluate a finite product in path integrals of harmonic oscillator?

How to directly evaluate path integral for harmonic oscillator by brute force method?


What is the physical significance of dot & cross product of vectors? Why is division not defined for vectors?


What's the reason for the minus sign in energy operator and momentum operator?

Why is there a minus sign in this wave equation derivation?


Why do moving water droplets form on the surface of a very hot pan?


What happens to light as it passes through a medium?

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


If "Temperature" of a thing is literally it's average kinetic energy then why doesn't a blowing fan increase a gas's "Temperature"?


Pumping up bicycle tires with helium instead of air

Will helium in the tires of a bike make it lighter?


Understanding the Formalism of wave function collapse


When you push an object, how much time does it take to start moving?

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


Path integral measure in Coleman's "Aspects of symmetry"


Why is $\langle x| x' \rangle=\delta(x-x')$?

How is the "normalisation" of non-normalizable states chosen?


Does the event of big bang violates first law of thermodynamics?

Conservation law of energy and Big Bang?


Calculating the force imparted on an object by a laser

If I'm floating in space and I turn on a flashlight, will I accelerate?


How can momentum but not energy be conserved in an inelastic collision?


Liouville integrability vs. separability

Is a system Liouville integrable if and only if its Hamilton-Jacobi equation is separable?


What causes a soccer ball to follow a curved path?


could a force with corolios and centrifugal terms be written as a potential gradient?

Potential for a general fictitious force?


Find maximum number of bricks that can be placed over each other


What is the difference between phase difference and path difference?


How does light re-accelerate after slowing down?

How does light speed up after coming out of a glass slab?


How do we know LIGO didn't detect stars but Black holes?

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


Why pressure in all direction is equal in a hydrostatic?

Define Pressure at A point. Why is it a Scalar?


Can someone use DC generator along with electric motor to make electricity along with mechanical energy?


Does the "center" of the gravitational field change as we approach the center of the mass?


How can a skull/head works as an 'amplifying' antenna?

Why does a remote car key work when held to your head/body?


Where does the momentum go when atom absorb a photon?

How does one account for the momentum of an absorbed photon?


Commutation relation for general case $[a^n, \bar{a}^m]=?$

What is the cleverest way to calculate $[\hat{a}^{M},\hat{a}^{\dagger N}]$ when $[\hat{a},\hat{a}^{\dagger}]=1$?


How can we be certain our world has only three spatial dimensions?

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


On the dimensionality of the Hilbert space for a central potential

Hilbert space of harmonic oscillator: Countable vs uncountable?


Lagrangian for the motion in a null geodesic

Lagrangian for relativistic massless point particle


Why is the $S_{z} =0$ state forbidden for photons?


Why do electron and proton have the same but opposite electric charge?


Condition for Maximum Power in the circuit

Is zero input impedance good or possible when considering impedance matching?


why do we relate spin with angular momentum operator in quantum mechanics?

What is spin as it relates to subatomic particles?


How a battery maintains the current in the circuit?

How is potential difference maintained in a battery?


Recommendations for Books on Lagrangian Mechanics


General relativistic Euler Lagrange equation

Geodesic equation from the proper time integral


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?


Gauge problem - Lagrangian for a massless particle in FRW


Where did the idea that there *might* be magnetic monopoles come from?

Why do physicists believe that there exist magnetic monopoles?


For a distant observer can a black hole form and grow in finite time?

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


Does a Single Electron moving in a vacuum tube with constant velocity radiate EM Wave?

Behaviour of free electron with constant velocity


Why are two photons created in annihilation?

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


Is this a way light/information could escape from a black hole?

Can we exit the event horizon of merging black holes?


Why kinetic friction does not depend on speed?

Does the force of kinetic friction increase with the relative speed of the objects involved? If not, why not?


Why can't an electric field line suddenly break?


Is kinetic energy a relative quantity? Will it make inconsistent equations when applying it to the conservation of energy equations?


Hydrostatic pressure - doesn't density vary with depth?


What is time, does it flow, and if so what defines its direction?


Is the gravitational field an illusion, a by-product of geometry?

If gravity isn't a force, then why do we learn in school that it is?


Continuous Lorentz Transformation for time-like and space-like points

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


String Theory- Are strings the end? What are they made of?

What are the strings in string theory made of?


Will a solution undissolve if left for a long time?

How does the dissolution of salt affect the solution density?


Why can't energy be created or destroyed?


What is the difference between virtual photons and real photons?

Virtual photons, what makes them virtual?


How can a pion with neutral charge exist?


From Quantum Mechanics to Classical Mechanics


How can mass bend spacetime, if there's nothing to bend?


What is the relation between potential energy & electric field?

Relation between potential difference and electric field


How can the tangent vector to a beam of light be expressed in these 2 ways?


If two objects collide, will the collision force be twice as big as the original force?

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


What constitutes an observation/measurement in QM?


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


Fluid Pressure: The Collision Model - Approximation or Truth?


A Basic Question about Gravity, Inertia or Momentum or something along those lines


Heisenberg uncertainty in $L^2([0, 1])$ space

How can I solve this quantum mechanical "paradox"?


Keep an object at a certain hight, does it require energy?

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


Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$


How to get distance when acceleration is not constant?


Chemical potential of particles with zero mass


Math required for learning Lagrangian mechanics

Which Mechanics book is the best for beginner in math major?


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


Assuming that the Cosmological Principle is correct, does this imply that the universe possess an empirically privileged reference frame?


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


How does a crow sitting on one of the electric lines attain the same potential as that of the line so as to prevent a charge flow through its body?

Why do birds sitting on electric wires not get shocked?


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


If energy is only defined up to a constant, can we really claim that ground state energy has an absolute value?


What is the difference between virtual object and virtual image?


Why does Pluto's orbit cross Neptune's orbit?


Where does the angular momentum of the solar system come from?

How do the Planets and Sun get their initial spin?


Relation between black hole mass and size applied to observable universe

How can the Schwarzschild radius of the universe be 13.7 billion light years?


Why is the relativistic Lorentz factor defined this way?

What does $\frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}$ mean with respect to special relativity?


Protons and Neutrons Overshoot Actual Mass?

binding energy of a nucleus is positive?


Is it possible to prove that planets should be approximately spherical using the calculus of variations?


Could electromagnetic charge curve something like spacetime in analogy with general relativity?

Has a metric formulation of electromagnetism ever been attempted?


Why can arbitrary two qubit density matrices be expressed in this form?

How to write a generic density matrix for multi qubit system


Why does $F=ma$? Is there a straightforward reason?


What is the reasoning behind the idea that light cannot escape from a black hole?

Why can't light escape from a classical black hole?


Is the accelerated expansion of the universe consistent with conservation of energy?

Conservation law of energy and Big Bang?


How can dark matter collapse without collisions or radiation?


Why am I not accelerated by the reaction force applied by Earth on me?

Normal reaction - force without acceleration


Why can't I connection the anode of a battery to the cathode of an other battery and get a current flowing?

Why does connecting a battery's positive terminal to the negative terminal of another battery not create a short circuit?


How is the formation of the first atoms related to the cosmic microwave background?


Mathematician learning theoretical physics


Why is the cloth cooled to a temperature below that of the hot wind?

Why does blowing on someone who is wet feel colder than on someone who is dry?


In the photon picture, how can light slow down and yet not be absorbed?

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


Charge enclosed by a Gaussian surface inside an uniformly charged thin sphere

Gravitational field intensity inside a hollow sphere


Is there any paper analyzing the validity of Relativity in expanding space?

Is it valid to apply Einstein's Relativity to scenarios involving expansion of space?


Why does space expansion not expand matter?


How to get the asymptotic expression of DOS near Van Hove singularity

DOS of Van Hove singularity in 2D square lattice tight binding model


What could explain the presence of Promethium in stars?

What could explain the presence of Technetium in the spectral lines of stars?


Which of these two forces is stronger: static friction or kinetic friction?

Can the coefficient of static friction be less than that of kinetic friction?


What would the rainbow look like if we could see the full EM spectrum?

Do rainbows have ultraviolet bands and infrared bands?


In QED why is the electron a point particle?

Where is the evidence that the electron is pointlike?


Local explanation of the Aharonov-Bohm effect in terms of force fields


Is escape velocity really a velocity (rather than a speed)?


Why are only some materials ferromagnetic?

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


What is a rocket engine thrusting against in space?


Quantum mechanical explanation of electrostatic force

Deriving the Coulomb force equation from the idea of photon exchange?


Variation in mass with gravitational potential energy


Why is the energy lost due to the internal resistance always equal to $(1/2)CV^{2}$ in a simple capacitor battery circuit?

Capacitor charging, work done by battery on changing polarity


From a traveler's point of view, what prevents him from reaching speed faster than light?

Constant $g$ acceleration from astronaut's frame of reference


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


How can water be harder and less dense at the same time?


How does Bernoulli's principle produce wing lift?

How much effect does the Bernoulli effect have on lift?


The universal covering group of a symmetry group

Why exactly do sometimes universal covers, and sometimes central extensions feature in the application of a symmetry group to quantum physics?


Why does a new drop rises when a one falls?

When a drop of water falls into water, where do the splashes come from?


Reason behind dependence of forces on the medium

Gravitational shielding and equivalence principle


If Earth is mostly fluid, why does it not stretch as it rotates?


Does any ordinary object emit radiation due to Unruh effect and equivalence principle?

Do all massive bodies emit Hawking or Unruh radiation?


The momentum representation of $x$ and $ [x,p]$

What's wrong with this derivation that $i\hbar = 0$?


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


Why do different letters sound different?


Can we use a telescope as a microscope and vice versa?

Compound microscope vs astronomical telescope


Is Bohmian mechanics really incompatible with relativity?


How does time stoppage inside a blackhole affect physics?

Can matter really fall through an event horizon?


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


I have problem understanding the direction of the shear stress


What is the force that stops a rotating wheel eventually?

What is the cause of rolling friction? & why is it less than sliding friction?


Why is potential energy negative when orbiting in a gravitational field?


Does friction in the given case take its maximum value directly so as to have rotational equilibrium or not ?

How to predict the motion of a cylinder on top of inclined plane in scenario with different coefficients of friction?


How is work done by friction in rolling without slipping zero?


What will be the effect on a rigid body if two like unequal parallel forces act on the body?

What will be the effect on a rigid body if two unlike unequal parallel forces act on the body?


Is Faraday's Law universally applicable?


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


What determines which frames are inertial frames?


How to account for the beam weight in a torque question?


Please help-- what object can I use to absorb static shock when getting out of my car?

How to avoid getting shocked by static electricity?


Energy of an electron in triangle potential

How does the uncertainty product $\Delta x \Delta p$ behave for the bound states of the triangular potential?


Kinetic energy is different in different frames of reference?

Is kinetic energy a relative quantity? Will it make inconsistent equations when applying it to the conservation of energy equations?


Where is the scientific evidence to support the assertion that nothing can travel faster than light in vacuum?

Is it proven experimentally that the speed of causality (light) is the maximum speed?


How do I understand the quantization of the total orbital angular momentum to values $l(l+1)\hbar^2$?

Quantization of orbital angular momentum


Why do you need symmetric and antisymmetric solutions of the time-independent Schrödinger Equation by a given potential $V(x)$?

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


Cylinder rolling on an incline with offset center of gravity

Equilibrium and movement of a cylinder with asymmetric mass centre on an inclined plane


Which class of Dynamical Systems is governed by Lagrangian Dynamics?

How general is the Lagrangian quantization approach to field theory?


Why is the Earth's or other planets orbit elliptical instead of being circular such as of moon?


What causes a particular object to have a tendency to go outwards in circular motion when the centripetal force is inwards to the center

How can the centripetal force lead to objects flying apart?


Why can't we notice crossing an event horizon?


Is there a formula to calculate how deep I go after jumping into water?

Platform diving: How deep does one go into the water?


Does observed red shift indicate expanding universe?

Other explanation for cosmological redshift?


Why does the surface of a lake suddenly change texture

Can wind blowing on smooth water create speckle interference patterns?


What is the causality of the higher velocity airflow over the top of an airfoil

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


Lagrange density for massless scalar field


Can Quantum Zeno effect stabilize unstable particles?

Quantum Zeno effect and unstable particles


Coriolis problem by conservation of angular momentum

Conservation Of Angular Momentum of a falling stone


Is the spin of a particle always a 50/50 chance of being different after measuring it in Quantum Entanglement

Is the wave function of a particle re-created after a measurement stops?


What is the relation between electromagnetic wave and photon?


Calculating the best approach speed to take a corner based on rotation speed

How is circular motion possible on a banked road when there is no Friction?


Why can't a Carnot engine heat sink be at absolute zero?

Is it theoretically possible to reach $0$ Kelvin?


Operators - how to motivate they must be linear ? Is this comment a hint?


Why does a light beam in a moving light clock follows a V shaped path?


Raman Scattering vs. Fluorescence (1-photon / 2-photon process)

What is the difference between Raman scattering and fluorescence?


Proof that ladder operators contains a complete set of eigenkets

How do we know that we have captured the entire spectrum of the Harmonic Oscillator by using ladder operators?


Are wormholes really a valid shortcut to distant points in the universe?


How is the total energy invariant under the addition of a total derivative?


Are there tests of the existence of false vacuum?

Are we living in a false vacuum? Is there any way to tell?


How come bigger black holes lose energy slower?

Why do larger black holes emit less Hawking Radiation than smaller black holes?


has there been any developments on what energy really _is_?

Do we have a better understanding of what energy is since Feynman's time?


What's the longest wavelength single photon we've ever observed?


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


Calculate velocity when mass hit the Sun

The Time That 2 Masses Will Collide Due To Newtonian Gravity


Acceleration as the second derivative of $e^{-\frac{1}{t^2}}$

Infinite series of derivatives of position when starting from rest


Heisenberg's Uncertainty Principle - Humans knowing vs values existing in nature

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


How can the antiparticle of Hawking radiation fall into the black hole?


How does anything move through a physical distance?


Expansion of the universe & laws of physics


Why does the gas get cold when I spray it?


Can someone explain to me what the phrase "Everything moves through space-time at the same speed" means?

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


Recommendations for good Newtonian mechanics and kinematics books


What velocity has a mass when launched tangently on one side of moon, to let it arrive at a position diametrically opposite on the moon?

Projectile/orbital motion over very long distance


Why does the water in a bucket stay even when swung around in circular motion?


Undergraduate quantum book treating density operators, mixed states, and entanglement


Lorentz transformation and symmetries of the Lagrangian

What conservation law corresponds to Lorentz boosts?


Relationship between balloon size and pressure


Why would renormalization be necessary without divergent integrals?

Why is renormalization necessary in finite theories?


Meaning of centrifugal term in the mechanical energy of a orbiting planet

How can you solve this "paradox"? Central potential


Why are usually 4x4 gamma matrices used?


Why did Newton state his first law separately even though it is apparently a direct consequence of the second law?


Good texts on Quantum Mechanics to accompany this online course

A book on quantum mechanics supported by the high-level mathematics


Doppler shift of light from stars and galaxies

How is Doppler redshift of distant galaxies established?


Two bodies connected to each other with with a string of lenth L is a rigid body?

degree of freedom of a rigid body 5 or 6?


Would running along Earth's Surface at escape velocity cause you to get out of the Earth's gravitational pull?


Explain reflection laws at the atomic level


How does electricity travel through a set of resistors arranged parallel to each other?

Electricity takes the path of least resistance?


What is the difference between weight and mass?


Can something go faster than the speed of light in a medium?

What happens if light/particles exceeded the speed of light for a particular medium?


How can neutral conductive fluids create a magnetic field?

Why geologist do not consider molten iron in the magma to be the source of Earth's magnetic field?


All the planets in our solar system rotate 'Anticlockwise', except Venus. Why is the only planet that rotate' clockwise'?

Why does Venus spin in the opposite direction?


Are virtual particles experimentally verifiable?


What does the bending of "The Fabric of Space Time" really look like?

Better explanation of the common general relativity illustration (stretched sheet of fabric)


If matter and antimatter repel, how do we know other galaxies aren't made of antimatter?

How would we tell antimatter galaxies apart?


Fun to read non-Feynman introductory physics book


Reason behind $L = T - V$ (Lagrangian formalism)

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


What if a black hole of normal matter and a black hole of antimatter collided?

What happens when a "matter-black-hole" and an "anti-matter-black-hole" collide?


If two pieces of the same type of metal touch in space, will they bond and be permanently stuck together?

Why don't metals bond when touched together?


How could we describe the electric bound state like hydrogen by QED?


Why are only the Lagrangian and Hamiltonian used in mechanics?

Why do we use the Lagrangian and Hamiltonian instead of other related functions?


Why do we have to use an integral in this scenario to figure out $v_{max}$?

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


Is it possible for random quantum fluctiations in the Universe to cause a new Big Bang before the death of the Universe?

Dark age of universe when all fusion process ceases?


How positron and electron annihilate forming photons?


2d particle collision, Time for one particle to catch another one


Question about interpreting probabilities in QM

Wavefunction, probability and impossible events


If matter and antimatter were produced equally during the big bang, where is the rest of the antimatter?

Baryogenesis only at the Planck scale, or none at all?


Where can I find a structured presentation of the equations of physics?


What will happen to a naked singularity during the Big Rip?

Will the Big Rip tear black holes apart?


Can electric field lines form close loops in EM?

Why can't electrostatic field lines form closed loops?


Is this answer stating that an external observer can see a black hole mass grow, correct?

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


Does a moving charge interact with the magnetic field it produces?

Force felt by a moving charge due to its own magnetic field?


Where is a good place to learn classical optics for high school competitions?


Is it really possible to create some mass only from equivalent energy?

What keeps mass from turning into energy?


Quantum Mechanics - How do we know that the observed locations of electrons are random?

How do we know that certain quantum effects are random?


Why does proton and electron attract each other?

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


From a particle's point of view is his temperature absolute zero

Is temperature a Lorentz invariant in relativity?


What are the (philosophical) implications (if any) of this experiment in relation to the Bohr-Einstein debates and hidden variable theories?

Does the new finding on "reversing a quantum jump mid-flight" rule out any interpretations of QM?


Learn QM algebraic formulations and interpretations


Violation of the Law of Conservation of Charge in black hole?

Evaporation of large charged black holes


Optics - Derivation of Linear Magnification of Lens without Sign Convention

Sign convention for mirror and lens formulas


Is gravitational acceleration less affected by relativistic mass increase?

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


Suggested reading for classical field theory

Need for a side book for E. Soper's Classical Theory Of Fields


Why are we able to use Components of Vectors?


What will happen if a plane trys to take off whilst on a treadmill?


If everything is made up of atoms, what is vacuum made up of?

What is meant by "Nothing" in Physics/Quantum Physics?


Does electron travel in vaccum in a double slit experiment?

Is the double-slit experiment typically carried out in a vacuum?


Literature on Quantum Field Theory/Standard Model Physics?

Books for particle physics and the Standard Model


Method of image charges: How does it work?

What is the justification for the method of images in electrostatics?


What is the origin of pseudo force in non-inertial frames?

What is the underlying explanation behind fictitious/pseudo forces?


A light shine when I move my cat or dog off the bed

Why does rubbing feet against sheets create a spark?


In the singularity prior to the big bang where time doesn't exist, if something is possible (making a big bang) will it eventually happen?

How can something happen when time does not exist?


Is quantum entanglement affected by time dilation?


Why does the atmosphere rotate along with the earth?


Relation between baryonic mass and luminosity

Why isn't dark matter just ordinary matter?


Why don't heavenly bodies attract each other stronger?

Why doesn't the Moon fall onto the Earth?


What will time dilation look like from multiple reference frames?

Time dilation - why the observers see each other the slow one but then one of them is older or younger?


Conservation of Energy in General Relativity

Is the law of conservation of energy still valid?


Why are heat capacities(at constant pressure and volume) different for the same substance?

Specific heat capacity at constant volume VS constant pressure


Can we use magnetic energy to convert electrical energy by replacing mechanical work by a fan for concern watch the video


Variation of ladder/barn paradox: can observer on ladder see that barn was too small?


Does gravity affects on electrons in a noticeable way?


Interference at the focus of a convex lens or a concave mirror


Entropy on interacting particles and objects


Does nature have more than four dimensions?

Experimental evidence of a fourth spatial dimension?


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


Which mode is a cantilever oscillating at when twanged at one side and changing the length?


How does "curved space" explain gravitational attraction?


If measurement cause collapse of wave function, does it mean that any other interactions also collapse wave function?

Why does observation collapse the wave function?


Can anyone tell me that actually What vector multiplication is?

What is the physical significance of dot & cross product of vectors? Why is division not defined for vectors?


Why is the speed of light the same for all colors in a vacuum but different depending on the color when light goes through a non-air medium?

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)?


Speed of light when it reflects from a surface

What happens when a photon hits a mirror?


Why escape velocity doesnot depend on angle of projection


Why the point right below the center of a rolling ball on the ball has zero instantaneous velocity

How can the contact point of rolling body have zero velocity?


Why is gravity high at poles but lower inside the surface of Earth, as compared to $g$ on surface?


Need for a side book for E. Soper's Classical Theory Of Fields


Apply force to one end of a rod in space: why not purely translational?

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


What causes the blur when my fingers are almost touching?

Why do shadows from the sun join each other when near enough?


What would actually happen to a person jettisoned into space?


Why is only one end at rest when a rope is attached to a cube?

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


Why is it that black holes emit Hawking radiation?

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


Hermitian Conjugate in Spherical Coordinate System

Hermitian conjugate of differential operator


Extra mass due to near light like speeds

Why does the (relativistic) mass of an object increase when its speed approaches that of light?


Do clocks near the centre of the galaxy run slower than clocks at the edge?

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


Can you please explain me phenomenon of reflection at subatomic level?

Explain reflection laws at the atomic level


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


What exactly causes quantum wave function collapse?

On the nature of the collapse of the wave function


Why is the gravitational force always attractive?


What is charge actually? How to define it?


Why must the probability be the integrated square modulus of the wave function


How can we explain, from quantum mechanics, why do we see light rays bend when light goes from one medium to another?

How are classical optics phenomena explained in QED (Snell's law)?


I m just try to make Free energy using buoyancy

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


Observers frame of reference for history / chronolgy of very early universe


Given the 1st Postulate of SR, doesn't the 2nd Postulate go without saying?

Einstein's first postulate implies the second?


An apparent contradiction to $m = m_0/\sqrt{1-v^2/c^2}$

Where's the energy in a boosted capacitor?


What if an object had enough speed that from another perspective it was enough to form a blackhole?

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


Tire traction force, friction or reaction?


Can you lift a basket up while standing inside it?


Invariant Phase space volume under canonical transfromation


Can someone explain the concept of 'Negative Probabilities' in an intuitive manner?

Negative probabilities in quantum physics


Isn't Dark Matter just an Indication that Relativity breaks down when describing large masses?

Why is dark matter the best theory available to explain missing mass problems?


Gravitational Effect Versus the Speed of Light


What should I have an understanding of before diving into R. Shankar's Quantum Mechanics?

What's the standard "roadmap" to learning quantum physics?


How Can There Be Magnetic Force Without Velocity

The equivalent electric field of a magnetic field


Why don't stationary electric charges possess a magnetic field?

No magnetic field from a static charge - Is there a simple physical argument to show why?


Show the Lie algebra is the same for $SU(2) \times SU(2)$ and Lorentz group

How do I construct the $SU(2)$ representation of the Lorentz Group using $SU(2)\times SU(2)\sim SO(3,1)$ ?


Why is the voltage drop across an ideal wire zero?


Calculate analytically the time until two spheres meet due to gravitation

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


Is momentum a source of Gravity in General Relativity?

Does non-mass-energy generate a gravitational field?


Good and simple reference for studying about ADM mass

References for cosmological perturbation theory in the ADM formalism


Difference between B and H in magnetic fields?

What's the difference between magnetic fields $H$ and $B$?


Using gravity to send messages (at the speed of light)

Would it be possible to transmit information through gravitational waves?


Why does a black hole have a finite mass?


Is it possible for one black hole to pull an object out of another black hole?


Why are people weightless whilst in orbit around the Earth? ISS? Satellites?


Why does the heaviest point on a spinning ball tend to become the topmost pole?

The secret behind the spinning, asymmetrically weighted, 2D disk-shaped top?


Explain reflection laws at the atomic level


What is the apparent viscosity in shear thinning turbulent flow through a pipe?

What's the shear rate in a turbulent flow?


Logical understanding of the canonical probability distribution (canonical ensemble)

Why does the Boltzmann factor $e^{-E/kT}$ seem to imply that lower energies are more likely?


Radial fall in a Newtonian gravitational field


How much extra distance to a CERN event horizon?

How much extra distance to an event horizon?


current in wire + special relativity = magnetism


Tracking the path of two point masses through time under the influence of gravity and with no initial velocities

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


Why is sound reflected and not transmitted through a wall?


What happens during the interaction of electromagnetic forces when two objects touch each other?

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


Is a nucleus a collection of quarks or a collection of neutrons and protons?

Why are protons and neutrons the "right" degrees of freedom of nuclei?


Equation to find how far into water you will sink depending on how high you jump from

Platform diving: How deep does one go into the water?


Acceleration of a ball thrown into the air


Work done by gravity on falling object does not seem to equal change in mechanical energy


Can moment of inertia give us information about shape of the body?

Infer the shape of a solid given the moments of inertia


In thermodynamics, how does the triple point occur?


Why is angular velocity of any point about any other point of a rigid body always the same?


What is the difference between the quantum states $\left|01\right> + \left|10\right>$ and $\left|01\right> - \left|10\right>$?

Singlet and Triplet states: Why is the $S=0$ state defined as it is?


The Time That 2 Masses Will Collide Due To Newtonian Gravity


What makes '$c$' $c$? And what if it was slightly different?

The origin of the value of speed of light in vacuum


What size hole will let air in but keep an 8"column of water from leaking out?

How to find out the maximum radius of a hole that can keep water stay in a container by water viscosity?


How come $\frac{d}{dt}\left(\frac{\partial {r_i}}{\partial {q_j}}\right) = \frac{\partial {\dot r_i}}{\partial {q_j}}$ in Lagrangian mechanics?

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


Regarding reservoir capacitor in diode bridge

What's the purpose of capacitors in parallel


How does a moving charge produce a magnetic field? In AC, charges are accelerating but they are possessing magnetic field also

How do moving charges produce magnetic fields?


Exactly solvable quantum dynamics problems

Systems in quantum mechanics solved by ladder operator method


Can Newton's second law for rotation be derived from Newton's second law for translation?

Deriving torque equation from Newton's 2nd Law


If the universe turns out to be infinite, would we have to reject the Big Bang Theory?


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


calculating the hydrostatic pressure in a non-cuboid shaped container

Pressure at base of 3 different dam designs


Commutator of $\hat {L}_x$ and $\hat{V}(\hat{r})$

Angular momentum squared and Hamiltonian?


Work on current loop placed in a magnetic field: how can there be work done against magnetic forces?

How can a magnetic field produce an emf if the force produced does no work?


Can gravitons travel faster than the speed of light?


Is gravity just the result of bending the space?

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


Why is the moment of inertia the integral of the "second moment"? What is the derivation for the formula?

Where does the formula for the moment of inertia $I = \int r^2 dm$ come from?


What does it mean that each conductor is characterized by a constant value of potential?

Why is the conductor an equipotential surface in electrostatics?


If energy cannot be created, how did the universe come into existence?

Conservation law of energy and Big Bang?


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


Gravitation: To find acceleration of a particle as a function of distance from centre of a tunnel dug along two points on Earth's surface

Period of oscillation through a hole in the earth


How can there be instantaneous rate of change?

How can there be really any instantaneous velocity?


Why does the tongue stick to a metal pole in the winter?


Could a negatively charged nucleus have caused the results in the Rutherford scattering experiment?


Damped harmonic oscillator Lagrangian $f(t)(\ddot{x}+\alpha\dot{x}+\omega^2x)=0$ determinate a function $f(t)>0$

Lagrangian and Hamiltonian EOM with dissipative force


Irreversible process with $dS=0$ (isolated system)

Can an adiabatic, isentropic transformation be irreversible?


What is the relationship between power and energy?


Does a magnetic field do work on an intrinsic magnetic dipole?


Why are atoms so different from one an another?

What enables protons to give new properties to an atom every time one is added?


Why are $\pi$ and $e$ used in so many physical formulae?


How can I derive $\langle p | x \rangle=e^\frac{ipx}{\hbar}$ without resorting to wave mechanics?

What does the Canonical Commutation Relation (CCR) tell me about the overlap between Position and Momentum bases?


Explain reflection laws at the atomic level


What common materials absorb most infrared light?


What Lorentz covariance has to do with Lorentz invariance?


Why does the earth revolve around the sun?

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


Why does a photon crossing a beamsplitter end up in a coherent superposition?

Why doesn't a typical beam splitter cause a photon to decohere?


Proving which Quantum Mechanics interpretation is correct

Proving which QM interpretation is correct


Problem regarding concept of conservation of angular momentum

Conservation of angular momentum exercise


What does the solution to a wave equation represent?


The second foci of the ellipsis of Earth around Sun

Significance of the second focus in elliptical orbits


What is the probability of a person quantum tunneling?


Macroscopic quantum phenomena and tunneling


Using dimensional analysis to guess formula ; too many flaws?

What is the justification for Rayleigh's method of dimensional analysis?


Is current in superconductors infinite? If they have 0 resistance then I (V/R) should be infinite?

How can Ohm's law be correct if superconductors have 0 resistivity?


Could it ever be possible to generate small gravitational waves?

Is it possible to produce gravitational waves artificially?


What are the evidences that support the EmDrive?

Is the EmDrive, or "Relativity Drive" possible?


The amount of potential energy at the height of h

Net work done on the body when we lift it and put it on the table is zero?


Why does a reaction force still allow the thing exerting the force to move?

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


Why do corn flakes clump together in milk when stirred?


Could the 4 Forces Split Off or "Decay" into Other Forces in the Distant Future?

Could spontaneous symmetry breaking happen again in our universe?


Need explanation for $CY_3$ folds comes first rather than algebraic curves comes first

Why (in relatively non-technical terms) are Calabi-Yau manifolds favored for compactified dimensions in string theory?


Calculation & derivation of de-Broglie wavelength


Direction of emf and it's physical sense?

Post Problem Analysis - Rod in a cylindrical time varying magnetic field?


Speed of heat / quantification of heat and other magnitudes


How is called the magnitude of acceleration?

Velocity is to speed as acceleration is to ________?


Does a charged capacitor weigh more than uncharged?

Does the mass of a battery change when charged/discharged?


Where did the Sun get its angular momentum?

How do the Planets and Sun get their initial spin?


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 lies at the very edge of the expanding universe?


Is it possible that the geometry of spacetime isn't Minkowskian, if we only take special relativity into account?

Why does Minkowski space provide an accurate description of flat spacetime?


How does a wheel balance itself during circular motion?

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


Does quantum mechanics invalidate causality and determinism?

Is the universe fundamentally deterministic?


Do solutions to the Euler Lagrange equation for physical Lagrangians actually minimize the action?

Type of stationary point in Hamilton's principle


What's the difference between "spectromicroscopy" and "microspectroscopy"?

What's the difference between microscopy and spectroscopy?


Is light a particle with EMF or does it travel in wave?

What is the relation between electromagnetic wave and photon?


What exactly implies the need of quantum mechanics for self-adjoint and not only symmetric operators?

Why is quantum mechancis is not content with symmetric operators, but wants self-adjoint operators?


Why does Planck's constant appear in classical statistical mechanics


Can a particle move from one place to another without traversing the space in between?


Why do some people claim that quantum physics and General relativity theory will never get along?

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


Is there a consensus about the trueness of the randomness in QM?


Why aren't electrons positively charged?

Why is the charge naming convention wrong?


Are black holes black because of gravity or time?


Calculating the unified atomic mass unit

Protons and Neutrons Overshoot Actual Mass?


Is photon truly a photon only in vacuum?

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


Why direction of dipole is from negative to positive?

Why does the direction of a dipole moment go from negative to positive charge?


Can there be other Positions of Geostationary Satellites?

Is it possible to have a geostationary satellite over the poles?


Why does light bend when it goes from one medium to another?


The Dirac-delta function as an initial state for the quantum free particle


Why are angular velocities of double pendulum small in small angle approximation?

Small oscillations of the double pendulum


Why does light have only 3 primary colours and why don't then non primary VIBGYOR colours disperse?

Is it only red, green and blue that can make up any color through additive mixture?


Where does the excess positive charge in a conductor reside?

How does positive charge spread out in conductors?


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


How do surfaces absorb or reflect light? Specifically, what is the physical process happening at the molecular level?


How long could you survive in Space without a Spacesuit?

How does space affect the human body (no space suit, no space craft)


Light bending by gravity? Photons are massless!


Why Negative refractive index is negative


Does light exit a single mode fiber in the same angle it enters?

Does optical fiber preserve the angles of incoming light?


Electromagnetic Waves and Quantum Field Theory confusion?

What is the relation between electromagnetic wave and photon?


Better explanation of the common general relativity illustration (stretched sheet of fabric)


How is the work done to push a planet over 1m with 1N the same as pushing a feather over 1m with 1N?

Why does the amount of energy transferred depend on distance rather than time?


How does one explain the rectilinear propagation of light?

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


Is there really time reversibility in physics?


Does pure yellow exist in variations we can't discern?

Why can we distinguish different pitches in a chord but not different hues of light?


Speed of light on and through a hollow planet


Could we use solar energy with endothermic reactions to fight global warming?

If humans were able to catch all sun energy reaching the earth for their use, will the climate change?


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


If I have a huge analog clock, what happens to the seconds hand if I build it longer than 2.864.788 kms?

Extended Rigid Bodies in Special Relativity


Explain $\Delta x = v_0t + \tfrac{1}{2}gt^2$ please?

Why there is a $\frac{1}{2}$ in the distance formula $d=\frac{1}{2}at^2$?


Functional Analysis for Quantum Mechnanics

A book on quantum mechanics supported by the high-level mathematics


What is the maximum reach distance of electric field?

Gravititonal fields compared to electromagnetic fields - are they infinite in range?


How can we justify identifying the Dirac delta function with the eigenfunction of position?

Physical position eigenfunction normalisation


Why do particles moving in circular motion emit em radiation?

Conceptually speaking, why does synchrotron radiation arise?


$ P = \frac {V^2}{R} $ derivation confusion

High Voltage Powerlines - clarification of energy loss


Electrostatic energy integral for point charges


Is this statement of the Heisenberg uncertainty principle correct?

Is the uncertainty principle axiomatic or derived?


Why can't "cold flow from an area of coldness to hotness?

I open the fridge - do I let the heat in or the cold out?


Does conservation of information mean that the direction of causality is arbitrary?

What is time, does it flow, and if so what defines its direction?


How does the curvature of spacetime induce gravitational attraction?


Matter and Antimatter (Hypothetical question)

What is "pure energy" in matter-antimatter annihilation made of?


Is there any Hamiltonian that contains time derivative?

Why can't $ i\hbar\frac{\partial}{\partial t}$ be considered the Hamiltonian operator?


Tension as a function of distance from the centre of a rod AB rotating about its end A

A rod of length $L$ & mass $M$ is rotating in a circle about one end then calculate tension in the rod at a distance $x$ from the support


Why is there a cap on the speed at which we can attain?

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?


Is temperature a Lorentz invariant in relativity?


Why does the magnitude of linear momentum of a particle in circular motion change with radius?

Why does the kinetic energy of a particle moving in circular motion increase when the turn radius decreases and no torque is acting?


What is this optical phenomenon, as looked from outer space?


Can black holes form in a finite amount of time?


How do these particles sort themselves by size?

Why do the big nuts always remain at top? The Brazil-nut Effect


Must there exist a Lagrangian for any 2nd order ordinary derivative equation?

How do I show that there exists variational/action principle for a given classical system?


Is there any physical simulator precise to atomic levels and quantum effects?

Does there exist a free good molecule / atom simulation software?


If we can predict the quantum leap, won't that render quantum computers useless?

Does the new finding on "reversing a quantum jump mid-flight" rule out any interpretations of QM?


Linearly expanding vacuum solves cosmological constant problem?

Friedmann vacuum solution linear rather than exponential?


Why does one Coulomb equal that strange number?

Why are there $1 / 1.602176634 \times 10^{-19}$ electrons in a coulomb?


What is a gauge (for someone who has not studied gauge theory)?


How much red, blue, and green does white light have?


What motion can emerge in a still universe?

What is the origin of spin of celestial objects?


Why are centrifuge space-station designs not a reality?

Will a machine or a technique ever be possible that allows artificial gravity in interplanetary space?


Why is the color of fire is yellow or blue sometimes?


Derivation of Equation of motion from Euler-Lagrange Equation

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


Why aren't all photons virtual particles even in the "vacuum" of empty space?


The facts of travelling at the speed of light


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


What does it mean for a Hamiltonian or system to be gapped or gapless?


How is angular momentum conserved for the orbiting body if the centripetal force disappears?

What would become of the earth's orbit if half of the sun's mass were suddenly to disappear?


Does Hawking radiation violate baryon number conservation?

No hair theorem for black holes and the baryon number


What (if any) state did energy exist in prior to the big bang?


No supersymmetric particles have been found in the LHC. Isn't this proof that Supersymmetry doesn't exist?


Are virtual particles limited by the speed of light?


What causes an electric shock - Current or Voltage?


Force and Torque being applied off-center due to magnetic forces


How is expansion of the Universe consistent with the speed of light?

How Are Galaxies Receding Faster Than Light Visible To Observers?


If the mass of the Earth is decreasing by sending debris in space, does its angular momentum also decrease?

Do mankind and manmade activities/constructions have any effect on the rotation of the Earth?


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


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


What is the difference between electric potential and electric potential energy?

What is the difference between electric potential, potential difference (PD), voltage and electromotive force (EMF)?


What is the essence of Lagrangian/Hamiltonian mechanics?

What exactly are Hamiltonian Mechanics (and Lagrangian mechanics)


Is a single photon emitted as a spherical EM wavefront?

Does spontaneous emission actually emit in a random direction, or is it measured in a random direction?


Derivative with Respect to Symmetric Tensor

Variation of the metric with respect to the metric


How do we know that $F = ma$, not $F = k \cdot ma$


Why are members of $L^2$ the only allowed quantum states?


Why is $dm$ and $\Delta m$ used this way in physics textbooks?

Difference between $\Delta$, $d$ and $\delta$


Does buoyant force acts on fully submerged objects?

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


Question on Gravity and the old "all objects free fall at the same rate regardless of their mass"

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


Can a shadow move faster than the speed of light?

Speed of Dark experiment, does it *really* travel faster than light?


Why is tension constant in a massless rope?


Nature of gravity: gravitons, curvature of space-time or both?


Newton-Euler equations in frame not centered at center of mass


What is the relation between electromagnetic wave and photon?


Why can't two electrical field lines intersect each other?

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


Imaginary part of the waveefunction in quantum mechanics

About the complex nature of the wave function?


Does the implications of double slit experiment contradict the "law of conservation of information"?

The Double Slit Experiment - delayed measurement


Does general relativity make time travel impossible or just very difficult?

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


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


Why must entangled particles communicate their spin instantaneously?

How do we know that entanglement allows measurement to instantly change the other particle's state?


What is the lowest frequency of light that can be found in nature?

Minimum frequency of an electromagnetic wave


Why do we have minimum deviation angle in a Prism?


Why are the properties of elements/atoms so varied?

What enables protons to give new properties to an atom every time one is added?


Does the uncertainty principle for energy and time prove it is impossible to reach absolute zero?

Absolute zero and Heisenberg uncertainty principle


What composes the E Field of the Electromagnetic Wave where "disturbances" for propagation occurs?


Brachistochrone Problem for Inhomogeneous Potential


Difference between $dM/dt $ and $\partial M/\partial t$

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


Can alpha, beta or gamma radiations emitted by a radioactive substance be controlled?

Changing the Half-Life of Radioactive Substances


How covalent bonding lower the energy of potential energy?


How is relativity related to anti-particles?

Is anti-matter matter going backwards in time?


What is the range of the validity of Coulomb's law?


When we ride a bicycle, why do we tend to move left when we turn it right?

Does leaning (banking) help cause turning on a bicycle?


What mistake am I making in plotting this graph of effective potential for the Earth-Moon system?

How can you solve this "paradox"? Central potential


Why is the index of refraction different for different wavelengths?


Could a big enough straw stretching from Earth to space eject atmosphere into space?

Would a pipe from the surface to the Earth's exosphere suck all atmosphere to the space?


What's the real fundamental definition of energy?


Finding the electric field of a NON uniform slab?

Electric field in a non-uniformly charged sheet


Does light ever experiences acceleration?

Does a photon instantaneously gain $c$ speed when emitted from an electron?


Does light accelerate when it meets a surface?

What happens when a photon hits a mirror?


Does Earth get gravity due to it's spinning?

The Earth is spinning, so why don't we jump and land on a different location?


Objects colliding at relativistic speeds combined energy?

What is the relative speed of two near-light speed particles headed towards each other?


What happens when two photons collide with one another, head on, dead center?

What would the collision of two photons look like?


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


$\rho g h$ and shape of container inconsistency?

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


Does getting hit by a gravitational wave hurt?

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?


Looking at past events by observing sky?

If you view the Earth from far enough away can you observe its past?


How can gravity increase $p$ without increase of $\rho$ or $T$?

Hydrostatic pressure - doesn't density vary with depth?


I don't understand what we really mean by voltage drop


Flux through a sphere due to a charge outside of it


Would the level of the water be rising, falling, or staying the same?

Basic buoyancy question: Man in a boat with a stone


Do neutrinos really have a massless state?

Which is the lightest thing in this universe? Is that a photon or neutrino?


How come a cork float to the side of a glass?

Why does a cork float to the side of a glass?


What is the difference between an electric field and gravitational field?

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


What is time, does it flow, and if so what defines its direction?


Technically, what is a spacetime singularity?

What is the definition of a timelike and spacelike singularity?


Why does ice have a lower density than water?


Why and how is sound produced when two objects hit each other?


Why does a photon take time to travel from one point to another if it travels with the speed of light?

If traveling at the speed of lights stops time, why does it take light 8 minutes to reach Earth?


How do I use a charge density to calculate an electric field (e.g. $\nabla \cdot\vec E = \frac{\rho}{\epsilon_0}$)?

How do I integrate the Poisson equation to determine the electric potential along a particular direction (e.g., $z$)?


Will movement of charged gaseous particles constitute electrical current?

Is a flow of ionized water an electric current?


Electric potential at earth and infinity

Why the electric potential of Earth is zero?


Radial/centripetal vs. tangential/linear vs. angular acceleration


Isn't the Big Bang contradictory with the existance of singularities in black holes?

Why did the universe not collapse to a black hole shortly after the big bang?


Is frequency quantized in the black body spectrum?


Is the electromagnetic spectrum discrete?


Why two separate batteries in a circuit don't work?

Why is there no current flow when I connect two opposite terminals of two separate batteries?


What is the relationship between a gravitational wave and a graviton?

Does the existence (now proved) of gravitational waves imply the existence of Gravitons?


Cosmic Inflation and the Distance between an Electron(s) and Their Respective Nucleus

Why does space expansion not expand matter?


Is there a symmetry associated to the conservation of information?


Thought experiment relating acceleration to rate of change of momentum in Newton's Second Law

What formula do I use to calculate the force of impact of a falling object?


Why does a simple pendulum or a spring-mass system show simple harmonic motion only for small amplitudes?


What do imaginary numbers practically represent in the Schrödinger equation?

Significance of $i$ in the Schrödinger equation


Special Relativity paradox of bridge and bus

What's the name for the relativistic paradox with the train/car travelling over a gap?


According to Newton's Law of Universal Gravitation, why isn't the universe shrinking?

How can the universe expand if there is gravitation?


What is time, does it flow, and if so what defines its direction?


Why is it brighter at noon than at just after sunrise?


Why is black a better emitter of heat than white?


Can matter actually cross the event horizon effectively falling into a Black hole?

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


Basic buoyancy question: Man in a boat with a stone


Why doesn't rain fall down in streams (as opposed to drops)


Does dividing a box full of gas at equilibrium change its entropy?

Gibbs Paradox - why should the change in entropy be zero?


A question about Einstein's elevator thought experiment

Difference between gravity and standing on a platform accelerating upwards at 9.81 m/s^2


What do we mean with magnetic monopole and dipole?


What is more fundamental, fields or particles?


Does space curvature automatically imply extra dimensions?


Breaking of diffeomorphism invariance after fixing a background metric

Einstein-Hilbert action as an effective field theory


Why can't we break the speed of light in vacuum?

Do we know why there is a speed limit in our universe?


Why different charges attract each other?

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


Is it possible to make a scooter that is propelled by perpetual magnets (without converting it to electricity)?


Why is the speed of light said to be constant when we know it slows down in a medium?

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


Does the Higgs field correspond to a "fifth" fundamental force?

Why isn't Higgs coupling considered a fifth fundamental force?


Does anything with non-zero rest mass and speed $c$ exist in the known universe?

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


Why does a lot of water vapour come suddenly after the heat source of boiling water is removed?

Why is there more steam after a pot of water *stops* boiling?


What is the physical basis for entropic gravity?


Difference between spin and polarization of a photon


Trying to understand velocity addition and time dilation


Does the speed of light vary in non-inertial frames?


Is there any ambiguity when forming operators for classical observables from other operators?


What's the difference between magnetic fields $H$ and $B$?


Math approach to Classical Thermodynamics

References about rigorous thermodynamics


Why is the weight of a constant mass different on the poles and on the equator?

Why is Earth's gravity stronger at the poles?


How do we determine who is the "observer" when calculating time dilation?


Magnetic induction (electron in hydrogen)

How to find the magnetic field due to a revolving electron of hydrogen atom in first orbit


Why is momentum conserved when a ball hits a vertical wall?


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


Unitary irreducible representations of the Diffeomorphism group

Unitary representations of the diffeomorphism group in curved spacetime


Why isn't everthing in a superposition state?

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


Why does ice become sticky the colder it gets?

Why does the tongue stick to a metal pole in the winter?


Do we have magnetic monopole? Is charge, according to yesterdays paper on Nature by Ray-Roukokoski-Kandel-Möttönen-Hall (30.01.14) quantized?


Why does the amplitude of a pendulum increases when continuously changing the rope length?

How can tangential acceleration from a radial force be explained?


I have a doubt regarding electric field inside uniformly charged spherical shell

Why is the electric field zero inside a hollow conducting sphere?


Is length contraction a physically real phenomenon?


can we have a parallel earth made of dark matter?


Can a particle stop disintegrating by zeno effect?

Quantum Zeno effect and unstable particles


Is there a speed limit for objects falling in gases or liquids?


How does blackholes become supermassive?


Infinitesimal transformations and Poisson brackets


What is the smallest amount of neutrinos needed to create a black hole?

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


The speed of light sets a lower limit to the rate at which a reference frame can pass through time. Is there anything that sets an upper limit?

Can an observer B move in such a way that his clock will run faster than that of a fixed observer A?


What is the difference between the mass of 100g and the weight of 1newton?

What is the difference between weight and mass?


Why don't we use vector sign for quantities in 1D motion?

In 1D why are vectors, such as, e.g., velocity $v$ and acceleration $a$, not written with a vector arrow?


Isn't there a loop in maxwell's equations?

Induced magnetic field produces electric field and vice versa forever!


What would be the shape of a candle in a zero gravity environment?


Why inverse square not inverse cube law?

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


How does the existence of a monopole affect the magnetic vector potential in gauss's law for magnetism?

Does existence of magnetic monopole break covariant form of Maxwell’s equations for potentials?


Can anyone recommend video lectures on all subjects of physics for a masters student?


Confusions on effective action and 1PI 3-point Green's function

Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions


Capacitance of two unequally charged conductors

How is the "charge on a capacitor" defined when two plates are unequally charged?


Lagrange's equation implying Newton's 2nd law?

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


Do photons move from their point of view?

Does a photon in vacuum have a rest frame?


Do different orbitals overlap in multielectron atom?

Number of Orbitals - Hydrogen Orbital just one, but why can we plot also higher states e.g. SPDF orbits?


Why is snow white when water has no color?

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


Why was there a need of defining spatial dimensions more than 3?


Does Coulomb's Law Hold for Particles in Motion?

Is Coulomb's law accurate for moving charges?


Difference between space-like and time-like singularities

What is the definition of a timelike and spacelike singularity?


How long would it take a human to reach Tau Ceti (11.89 LY) safely?

Travel duration from Earth to a star at 9.8 m/s² acceleration


Most general form of motion where period is amplitude independent

Is there an intuitive reason the brachistochrone and the tautochrone are the same curve?


What does it mean to say work is path-independent when pushing an object in different directions?


If hot air rises, why is it colder at higher altitudes?


How does a photon represent electric and magnetic fields to propagate?

What is the relation between electromagnetic wave and photon?


Clashing definition of rays in Weinberg and Sakurai and Born interpretation without normalizability

Quantum states as rays as opposed to vectors


Does Earth experience any significant, measurable time dilation at perihelion?

Since the Earth is moving through space, do we experience time dilation?


How can only the change in direction can be called acceleration?

Why does a change of direction imply an acceleration?


Why does a helium filled balloon move forward in a car when the car is accelerating?


How do electrons in the circuit know that there is less resistance on that path, how do they always chose the most efficient path?

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


Why current in series circuit is the same?


Will two identical charges moving at the same velocity experience magnetic force due to each other?

The equivalent electric field of a magnetic field


How does centrifugal force resemble gravity?


Sign of Feynman diagram with single-propagator closed loop

Why is there extra minus sign in Feynman's rules for every closed fermionic loop?


From Noether's Theorem, is it true that the law of conservation of energy can be proved?

Noether Theorem and Energy conservation in classical mechanics


How is possible to create a pressure greater than Earth core's pressure in laboratory?

For the recently reported production (January 2017) of metallic hydrogen in the laboratory - what is the evidence exactly?


How likely is it that metallic hydrogen is metastable at atmospheric pressure?

Are there published predictions that hydrogen could remain metallic at ambient pressure?


Problems with using Compound microscope and telescope in the place of each other

Compound microscope vs astronomical telescope


Dancing twins, one travelling in a rocket ship, looking through telescopes at each other

Time dilation and twin paradox: If they twins were speaking on a phone of some kind, how would each other's voices sound?


Could space itself be made out of particles?

Does String theory say that spacetime is not fundamental but should be considered an emergent phenomenon?


Needed small explanation of the notation in this paper

Square bracket notation for anti-symmetric part of a tensor


Features used in quantum mechanics but not used in classical mechanics


Classically, how would an electron orbiting a proton in a perfectly circular orbit emit photons?


Why do car wheels seem to roll backwards

Why does the wheel of a car appear to be moving in opposite direction?


The physical definition of work seems paradoxical

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


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


How to understand "accelerating charge radiate" using intuition?

How EM waves are produced by accelerating charged particles?


Where can some worked problems in classical mechanics (and more specifically the Lagrangian and Hamiltonian formalisms) be found?


Apparent Violation of Newton's $3^{\text{rd}}$ Law and the Conservation of Momentum (and Angular Momentum) For a Pair of Charged Particles


What keeps mass from turning into energy?


How does the Higgs Boson gain mass itself?


What gives an elementary particle a charge?


Is there an upper limit to a rocket's size/payload?


Why are interactions always mediated via bosons (as opposed to fermions)?


Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket?


Vertical component of moving weight at a 45 degree angle


If you have a conserved quantity, why can't you use it to eliminate a variable in the Lagrangian?


What does it mean to say "Gravity is the weakest of the forces"?


Why is the Earth shaped like a sphere and not any other shape: cube, prism?

Why are stars, planets and larger moons (approximately) spherical in shape (like, the Sun, the Moon, the Earth, and other planets)?


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


Why don't metals bond when touched together?


Why is the speed of light arbitrarily the limit?

What is so special about speed of light in vacuum?


What is a good introductory book on quantum mechanics?


What is the intuition behind the direction of torque?


What is a good mechanics book without calculus

Recommendations for good Newtonian mechanics and kinematics books


What are the Time Operators in Quantum Mechanics?

Why there is no operator for time in QM?


Displacement current - how to think of it


What is thermal radiation? How does it move through space?


Does dark matter get drawn into black holes?


How does Einstein got equivalent mass - energy equation E=mc2?

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


Why does Hawking Radiation not add up to zero?

Black holes and positive/negative-energy particles


Balloon tethering cable tension model (catenary tether)

What is the equation for the tension on the ends of a cable suspended at different heights?


While Space-man lives for 1 day, then how long does Earth-man live ? 1000 years or 1 second?

Twin Paradox, calculating spacetime intervals from both perspectives


Why is there no gravity in the center of a celestial body, yet there is gravity on the surface?


Why gravity decreases as we go under ground?


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


Why does dust stick so well to fan blades?

Why does dust stick to rotating fan propeller?


Reduced mass in quantum physics (Hydrogen Atom)

Why is a proton assumed to be always at the center while applying the Schrödinger equation?


Why does Quantum Field Theory use Lagrangians rather than Hamiltonians?

Why not use the Lagrangian, instead of the Hamiltonian, in nonrelativistic QM?


How does Newton's first law asserts the existence of inertial frames?

History of interpretation of Newton's first law


Finding the radius of curvature of mercury surface in a rotating cylinder


Explanation of the classic jerk and pull string system

Understanding which string breaks when one pulls on a hanging block from below


why is electric field inside a conductor zero?

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


Conditions permitting rotation to imaginary time

Performing Wick Rotation to get Euclidean action of a scalar field $\Psi$


What does "mathematically well defined" quantum field theory mean?

What does it mean for a QFT to not be well-defined?


Is the wave-particle duality a real duality?


How to study physics as a first year student?

How to learn physics effectively and efficiently


How do we know that the conservation of energy is true?

Why can't energy be created or destroyed?


Wheel doing work against gravitational energy

Work done by a homogeneous gravitational field on a system of particles


Is it possible to have things orbit around us?


Space expansion and conservation of energy

Why does space expansion not expand matter?


electric charge is a intrinsic property how is there a prpoer way to explain electric charge?

Definition of electric charge and proper explanation


Why is the charge naming convention wrong?


What would be a suitable textbook of first semester physical chemistry?

Where should a physicist go to learn chemistry?


Why are FM radio waves less susuceptible to interference than AM?

Why does noise affect FM radio less than AM?


If the electric field inside a conductor is zero then how does current flow through it?

Is there no electric field inside a conductor?


Galilean transformation of Schrodinger equation and momentum operator

Galilean invariance of the Schrodinger equation


How exactly and WHY does matter affect space-time?


Why are objects (such as planets) in motion and not static?

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


Addtional QFT Book synergetic to Srednicki. Differences $\phi^4$ and $\phi^3$

A No-Nonsense Introduction to Quantum Field Theory


How can we know the time frames for events in the early universe?


Based on our current observations, what all prevents a formed black from experiencing a repulsive force to overcome its gravitational force...?


How does color (or reflection in general) work?


Are all galaxies we see really our Milky Way? Any possibility?


Why Dirac monopole is a topological defect in a $U(1)$ gauge theory?

Does magnetic monopole violate $U(1)$ gauge symmetry?


What is the purpose of condenser lenses in the slide projector shown below?

what is the purpose of condenser lens in a slide projector?


Minimum frequency of an electromagnetic wave

Maximum wavelength of a photon/electromagnetic radiation?


Sequence of topics for studying quantum theory (Research strategy)

Should I begin to study quantum mechanics or wait until I have a stronger base on easier topics?


According to the doppler effect , if my source is faster than sound , will I hear the sound backwards?

Hearing a sound backwards because of Doppler effect


Expansion of the Universe and Conservation of Energy

Is the total energy of the universe zero?


Do we have a better approximation of $c$ than 299792458 m/s?

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


Difference between sudden force and impulsive force?

The elusive difference between force and impulse


If the universe is closed, does the twin paradox really matter?

Symmetrical twin paradox in a closed universe


Is there a limit to how hot an object can be?

Why is there no absolute maximum temperature?


Action is equal to reaction. Then how is a horse able to pull a cart?

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


How can matter be squeezed extremely dense


Why rotating reference frames are not inertial?


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


How can we move an object with zero velocity?


Are there any books similar to Universe?

Books for particle physics and the Standard Model


Planck's law: $B_\nu (\nu, T)$ to $B_\lambda (\lambda, T)$


In an alternating current, do electrons flow from the source to the device?


Why doesn't matter pass through other matter if atoms are 99.999% empty space?


Energy losses in transmission of electricity

High Voltage Powerlines - clarification of energy loss


Experimental proof of time-reversibility in microscopic classical physical laws

What sort of experiment would directly test time reversal invariance?


Will the momentum be conserved in this scenario?


How do moving charges produce magnetic fields?


Can electric field and force be in opposite directions?

Confusion regarding the direction of an electric field


How big a lens would you need to light a fire with moonlight?

Is it possible to start fire using moonlight?


Which fundamental force is responsible for the Casimir effect?

what is the relationship between the dynamical casimir effect and virtual particles?


Resource recommendations on Renormalization Group Flow

Suggested reading for renormalization (not only in QFT)


Distance traveled equals area under velocity time graph

Area under and slope of the motion graphs


Time dilation cancelling out due to relative motion


Why magnetic field applies force on a moving charge?

Is there any way to justify or derive the form of the Lorentz force from relativity theory?


Why is dipole the simplest source in electrodynamics?


Why is center of gravity a different quantity than center of mass?

What's the difference between centre of mass & centre of gravity for massive bodies?


What are the conditions for a clean night sky? With plenty stars?

Why can I never see any stars in the night sky?


Temperature of the Sun via Stefan-Boltzmann law

Temperature on the surface of the sun calculated with the Stefan-Boltzmann-rule


Why is average velocity the midpoint of initial and final velocity under constant acceleration?


On dark matter distribution and effects at terrestrial (or solar system) scale

Why doesn't dark matter affect planetary motion?


Why does cold metal seem colder than cold air?


What is the actual reason for the effects of fictitious forces?

What is the underlying explanation behind fictitious/pseudo forces?


What exactly is expanding when they say universe is expanding?

Why does space expansion not expand matter?


Quantum Entanglement - What's the big deal?


Can inertial mass affect gravity of the object?


Are we travelling at a speed close to the light speed?


Canonical everyday-life example of a technology that could not work without humans mastering QM in analogy to the application of GR in GPS?


At what temperature will the hydrogen molecules escape from earth's surface?

Why doesn't hydrogen gas exist in Earth's atmosphere?


Why can we only add or subtract things of the same dimension (meters/second, newtons, etc)?


Apparent weight of an empty balloon vs apparent weight of a balloon filled with air

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


Does throwing a watch into the air cause it to gain or lose time?


Can someone put entanglement in laymens terms?


How does the Higgs boson give mass to other elementary particles like electrons?


Could pp Collisions in the LHC produce Gravitons?

Why can't gravitons be created in traditional particle accelerators?


Why does our Solar system not feel the effects of dark matter the way our galaxy does?

Why doesn't dark matter affect planetary motion?


Why can the internal energy of a substance never be zero?

Absolute zero and Heisenberg uncertainty principle


Why a half-integer spin implies "antisymmetry" on the wave function?

What causes the Pauli exclusion principle (and why does spin 1/2 = fermion)?


Why does a marble in a merry-go-round move towards the edge?

Why horse rides in a merry-go-round swing outward?


Why I will feel colder when I get out from a swimming pool?

Why does blowing on someone who is wet feel colder than on someone who is dry?


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 does the Higgs Boson gain mass itself?