User David Elm

14 votes

Can Newton's laws of motion be proved (mathematically or analytically) or are they just axioms?

answered Nov 12, 2016 at 18:10

8 votes

Why can electric cars recoup energy from braking, but a spaceship cannot?

answered Mar 8, 2017 at 22:50

8 votes

Accepted

Where does the electron come from when a free neutron transforms?

answered Mar 18, 2020 at 17:06

6 votes

Accepted

If a planet's core is heated by its gravitational pressure, where does that energy come from?

answered Nov 30, 2016 at 10:26

6 votes

What is a phonon?

answered Nov 20, 2016 at 17:59

5 votes

Can a magnet bend light?

answered Oct 9, 2019 at 5:54

5 votes

How can a photon collide with an electron?

answered Apr 12, 2020 at 20:51

4 votes

Accepted

Momentum of a charged particle in a magnetic field

answered Nov 14, 2016 at 7:16

3 votes

How are the higher derivatives (jerk, jounce) of position with respect to time used in physics?

answered Oct 25, 2016 at 17:10

3 votes

Reason why only massless particles can travel at speed of light?

answered Oct 26, 2016 at 20:37

3 votes

What is the reason that Quantum Mechanics is random?

answered Jun 19, 2020 at 15:31

3 votes

Tempo versus Pitch

answered Mar 19, 2020 at 6:07

2 votes

How to determine the sign conventions when two masses are attached via pulley when one of them on inclined plane?

answered Mar 20, 2017 at 20:30

2 votes

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

answered May 6, 2017 at 15:56

2 votes

How to deduce $E=(3/2)kT$?

answered May 7, 2017 at 16:52

2 votes

What does "point of application of force" mean in the given context?

answered Oct 27, 2016 at 8:31

2 votes

What is the speed of a black hole?

answered Oct 27, 2016 at 8:43

2 votes

Accepted

How is the induced electric field due to a changing magnetic field divergence free?

answered Nov 14, 2016 at 7:52

2 votes

Is linear monemtum conserved with in angular momentum?

answered Nov 11, 2016 at 5:21

2 votes

Has everyone been drawing EM light waves wrongly this whole time?

answered Nov 11, 2016 at 5:39

2 votes

How to measure EMF of a Cell?

answered Nov 20, 2016 at 18:51

2 votes

Are vacuum fluctuations really happening all the time?

answered Nov 23, 2016 at 10:26

2 votes

How is the Schrödinger equation solved for time varying curved potential barriers?

answered Nov 24, 2016 at 10:31

2 votes

Accepted

Is it possible for there to be a spacetime which shares one of our dimensions?

answered Nov 28, 2016 at 12:23

2 votes

Can photons be created without an electric charge involved?

answered Dec 6, 2016 at 12:39

1 vote

Momentum and energy as a function of time

answered Dec 8, 2016 at 9:51

1 vote

Why don't neutrons in a nucleus decay?

answered Dec 21, 2016 at 1:40

1 vote

Was there a first moment in time?

answered Mar 10, 2017 at 6:38

1 vote

How to tell if an orbit is closed or opened?

answered Nov 11, 2016 at 6:44

1 vote

Accepted

Would the Earth form a black hole if time stopped?

answered Nov 24, 2016 at 13:41

Stack Exchange Network

59 Answers

Can Newton's laws of motion be proved (mathematically or analytically) or are they just axioms?

Why can electric cars recoup energy from braking, but a spaceship cannot?

Where does the electron come from when a free neutron transforms?

If a planet's core is heated by its gravitational pressure, where does that energy come from?

What is a phonon?

Can a magnet bend light?

How can a photon collide with an electron?

Momentum of a charged particle in a magnetic field

How are the higher derivatives (jerk, jounce) of position with respect to time used in physics?

Reason why only massless particles can travel at speed of light?

What is the reason that Quantum Mechanics is random?

Tempo versus Pitch

How to determine the sign conventions when two masses are attached via pulley when one of them on inclined plane?

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

How to deduce $E=(3/2)kT$?

What does "point of application of force" mean in the given context?

What is the speed of a black hole?

How is the induced electric field due to a changing magnetic field divergence free?

Is linear monemtum conserved with in angular momentum?

Has everyone been drawing EM light waves wrongly this whole time?

How to measure EMF of a Cell?

Are vacuum fluctuations really happening all the time?

How is the Schrödinger equation solved for time varying curved potential barriers?

Is it possible for there to be a spacetime which shares one of our dimensions?

Can photons be created without an electric charge involved?

Momentum and energy as a function of time

Why don't neutrons in a nucleus decay?

Was there a first moment in time?

How to tell if an orbit is closed or opened?

Would the Earth form a black hole if time stopped?