User Maximal Ideal

52 votes

4 answers

13k views

How are magnets held together, and why do they not explode?

asked Feb 10, 2020 at 3:54

25 votes

5 answers

6k views

How would physics explain why I can't un-fold paper? [duplicate]

asked May 25, 2021 at 15:57

21 votes

2 answers

2k views

Flywheel half-way through the event horizon of a black hole vs the equivalence principle

asked Jan 14, 2022 at 5:23

21 votes

5 answers

6k views

When an object crosses a black hole event horizon, does the entire object cross the event horizon "all at once?"

asked Jan 16, 2022 at 23:55

20 votes

7 answers

5k views

Plank overhanging off a building — where does the normal force go?

asked May 20, 2023 at 18:36

18 votes

3 answers

4k views

What exactly would it take to show (hypothetically) that the speed of light (in vacuum) is not constant?

asked Jun 9, 2022 at 4:19

18 votes

6 answers

4k views

Have we directly observed the electric component to EM waves?

asked Apr 17, 2017 at 4:51

13 votes

6 answers

1k views

(A modification to) Jon Pérez Laraudogoita’s "Beautiful Supertask" — What assumptions of Noether's theorem fail?

asked Jul 24, 2023 at 15:55

12 votes

3 answers

979 views

Do (classic) experiments of Compton scattering involve bound electrons?

asked Nov 14, 2022 at 16:20

10 votes

3 answers

2k views

Apparent contradiction between moment of inertia and Archimedes's law of the lever

asked May 11, 2023 at 0:03

7 votes

2 answers

761 views

Is Newton-Cartan theory really equivalent to Newton's theory of gravity?

asked Feb 27, 2023 at 16:47

6 votes

2 answers

615 views

Can an electron "annihilate" with something other than a positron?

asked Dec 16, 2022 at 4:19

6 votes

2 answers

143 views

Can fundamental particles have magnetic/electric quadrupoles, octopoles, and higher-order moments?

asked Apr 16, 2022 at 10:20

6 votes

0 answers

408 views

Explanation for possible interference on a home mirror?

asked Feb 13, 2018 at 9:23

5 votes

0 answers

225 views

Clarification about Heisenberg’s 1925 paper and the Bohr-Sommerfeld rule

asked Jan 13, 2018 at 22:18

5 votes

3 answers

464 views

Where does the metric directly manifest in physics?

asked Jun 28, 2019 at 21:10

5 votes

1 answer

155 views

What piece of technology is able to record the exact phase of microwaves?

asked Mar 2, 2020 at 4:41

5 votes

1 answer

675 views

Water wave analog of Casimir effect — Does it involve the zeta function? If not, why do QED calculations involve the zeta function?

asked Mar 8, 2022 at 0:05

5 votes

1 answer

1k views

de Sitter space vs de Sitter universe

asked Apr 3, 2022 at 0:07

5 votes

2 answers

491 views

Acceleration is absolute — is this really true? [closed]

asked Jan 7, 2023 at 21:23

5 votes

3 answers

566 views

What is the result of this Newton's cradle experiment where the initial ball doesn't bounce (exactly as in the regular case) but it has glue on it?

asked Sep 3, 2023 at 18:01

5 votes

2 answers

207 views

What justifies the use of braket notation to label "macrostates?" Is there a rigorous procedure or is it just a heuristic?

asked Jun 1, 2023 at 18:03

4 votes

2 answers

924 views

How do we justify that work is a "transfer of energy" in the general case?

asked May 15, 2023 at 16:20

4 votes

1 answer

165 views

How does spatial homogeneity make sense in general relativity?

asked Jan 27, 2023 at 0:06

4 votes

3 answers

364 views

Why is the flatness problem called the "flatness" problem? What is its connection to geometry?

asked Apr 23, 2022 at 21:11

4 votes

2 answers

408 views

All forces break down into the four fundamental forces/interactions ― Is this really true?

asked Mar 9, 2022 at 16:40

4 votes

1 answer

176 views

How can we claim that electromagnetism has positive definite energy if the energy density is underdetermined?

asked Dec 24, 2021 at 5:36

4 votes

1 answer

153 views

What are the ways we have control over single photon emitters? Are there single photon emitters "on demand?"

asked Aug 19, 2019 at 0:48

4 votes

1 answer

168 views

What happens if one end of an "ideal string" is vibrated at a frequency not equal to the harmonic modes?

asked Oct 24, 2019 at 22:17

4 votes

1 answer

155 views

Can tidal locking increase rotational kinetic energy? Where does the energy come from then?

asked Jul 20, 2020 at 22:50

Stack Exchange Network

149 Questions

How are magnets held together, and why do they not explode?

How would physics explain why I can't un-fold paper? [duplicate]

Flywheel half-way through the event horizon of a black hole vs the equivalence principle

When an object crosses a black hole event horizon, does the entire object cross the event horizon "all at once?"

Plank overhanging off a building — where does the normal force go?

What exactly would it take to show (hypothetically) that the speed of light (in vacuum) is not constant?

Have we directly observed the electric component to EM waves?

(A modification to) Jon Pérez Laraudogoita’s "Beautiful Supertask" — What assumptions of Noether's theorem fail?

Do (classic) experiments of Compton scattering involve bound electrons?

Apparent contradiction between moment of inertia and Archimedes's law of the lever

Is Newton-Cartan theory really equivalent to Newton's theory of gravity?

Can an electron "annihilate" with something other than a positron?

Can fundamental particles have magnetic/electric quadrupoles, octopoles, and higher-order moments?

Explanation for possible interference on a home mirror?

Clarification about Heisenberg’s 1925 paper and the Bohr-Sommerfeld rule

Where does the metric directly manifest in physics?

What piece of technology is able to record the exact phase of microwaves?

Water wave analog of Casimir effect — Does it involve the zeta function? If not, why do QED calculations involve the zeta function?

de Sitter space vs de Sitter universe

Acceleration is absolute — is this really true? [closed]

What is the result of this Newton's cradle experiment where the initial ball doesn't bounce (exactly as in the regular case) but it has glue on it?

What justifies the use of braket notation to label "macrostates?" Is there a rigorous procedure or is it just a heuristic?

How do we justify that work is a "transfer of energy" in the general case?

How does spatial homogeneity make sense in general relativity?

Why is the flatness problem called the "flatness" problem? What is its connection to geometry?

All forces break down into the four fundamental forces/interactions ― Is this really true?

How can we claim that electromagnetism has positive definite energy if the energy density is underdetermined?

What are the ways we have control over single photon emitters? Are there single photon emitters "on demand?"

What happens if one end of an "ideal string" is vibrated at a frequency not equal to the harmonic modes?

Can tidal locking increase rotational kinetic energy? Where does the energy come from then?