User mike stone

82 votes

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

answered Mar 19, 2017 at 13:20

76 votes

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Why does a body always rotate about its center of mass?

answered Feb 12, 2017 at 16:26

69 votes

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Why doesn't a mercury thermometer follow the rules of volume dilatation?

answered Nov 11, 2020 at 21:32

62 votes

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Rotate an object about the time axis

answered May 2 at 12:57

55 votes

Can a battleship float in a tiny amount of water?

answered Dec 16, 2018 at 14:13

53 votes

What is a joule? I find the definition confusing

answered Mar 24, 2022 at 13:43

31 votes

Why do physicists use the Bra and Ket notation when mathematicians tend not to?

answered Apr 28, 2021 at 21:33

30 votes

Triviality of interacting QFT

answered Jun 5, 2020 at 22:10

29 votes

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Why does it take so long for a gas to reach a thermal equilibrium?

answered May 3, 2021 at 17:01

26 votes

Must observables be Hermitian only because we want real eigenvalues, or is more to that?

answered Apr 24, 2021 at 12:08

24 votes

Why is the mechanical advantage 8 and not 4 in this pulley system?

answered Jul 19, 2021 at 21:40

21 votes

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Why haven't we found thermal superconductors?

answered Aug 3 at 14:38

21 votes

Why do images not appear inverted when looking directly through a pinhole camera?

answered Apr 10, 2021 at 12:06

20 votes

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Is the right hand rule a trick to avoid tensors?

answered Sep 8, 2018 at 15:24

20 votes

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Lorentz invariance of Maxwell's equations in matter

answered May 8, 2019 at 15:44

20 votes

Approximating an expression for a potential

answered Aug 4, 2019 at 12:40

19 votes

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If frequency of photons is a continuous spectrum, wouldn't the chance of a photon having the exact right frequency to excite an electron be zero?

answered Apr 14, 2022 at 17:18

19 votes

Non-unique zero function in the function space (Hilbert space)

answered Apr 20, 2020 at 17:30

15 votes

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Why isn't the moment of inertia of a cylindrical tube the difference of those of two cylinders?

answered Sep 30 at 17:33

15 votes

Is continuity of the wavefunction "put in by hand" for the Dirac delta potentials?

answered Nov 15, 2020 at 20:06

14 votes

WHY can't we use conservation of energy to find speed of the earth around the sun?

answered Apr 15 at 0:35

14 votes

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Misunderstanding of the magnetic field

answered Jun 7, 2020 at 18:15

14 votes

Can you make a laser without cavity, if you have a pump strong enough? I think no, but is my reasoning correct?

answered Apr 12, 2020 at 13:20

14 votes

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How does a linear operator act on a bra?

answered Sep 13, 2019 at 12:49

14 votes

Are the speed of sound and water ripples' speed the same?

answered Feb 27, 2021 at 20:30

13 votes

Interpretation of gravitational waves

answered Aug 18 at 13:52

13 votes

Do elementary particles at rest produce magnetic fields?

answered Oct 25, 2020 at 19:19

13 votes

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Can a Hermitian operator $A$ bring a wavefunction $|\psi \rangle$ out of Hilbert space?

answered Sep 6, 2019 at 14:41

13 votes

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Eigenstates of QM harmonic oscillator in momentum space

answered Apr 26, 2021 at 12:47

13 votes

Do spinors form a vector space?

answered May 16, 2021 at 13:57

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1,689 Answers

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

Why does a body always rotate about its center of mass?

Why doesn't a mercury thermometer follow the rules of volume dilatation?

Rotate an object about the time axis

Can a battleship float in a tiny amount of water?

What is a joule? I find the definition confusing

Why do physicists use the Bra and Ket notation when mathematicians tend not to?

Triviality of interacting QFT

Why does it take so long for a gas to reach a thermal equilibrium?

Must observables be Hermitian only because we want real eigenvalues, or is more to that?

Why is the mechanical advantage 8 and not 4 in this pulley system?

Why haven't we found thermal superconductors?

Why do images not appear inverted when looking directly through a pinhole camera?

Is the right hand rule a trick to avoid tensors?

Lorentz invariance of Maxwell's equations in matter

Approximating an expression for a potential

If frequency of photons is a continuous spectrum, wouldn't the chance of a photon having the exact right frequency to excite an electron be zero?

Non-unique zero function in the function space (Hilbert space)

Why isn't the moment of inertia of a cylindrical tube the difference of those of two cylinders?

Is continuity of the wavefunction "put in by hand" for the Dirac delta potentials?

WHY can't we use conservation of energy to find speed of the earth around the sun?

Misunderstanding of the magnetic field

Can you make a laser without cavity, if you have a pump strong enough? I think no, but is my reasoning correct?

How does a linear operator act on a bra?

Are the speed of sound and water ripples' speed the same?

Interpretation of gravitational waves

Do elementary particles at rest produce magnetic fields?

Can a Hermitian operator $A$ bring a wavefunction $|\psi \rangle$ out of Hilbert space?

Eigenstates of QM harmonic oscillator in momentum space

Do spinors form a vector space?