User Diracology

63 votes

What makes cheese so effective at absorbing microwaves?

answered Jan 25, 2017 at 18:22

49 votes

Accepted

Why is Helium so hard to liquify?

answered May 24, 2016 at 12:41

41 votes

How did Rutherford conclude that most of the mass (as well as the positive charge) was concentrated in the nucleus?

answered Apr 13, 2017 at 12:22

38 votes

Accepted

Why gold is always measured with a balance and not with a scale?

answered Jul 21, 2023 at 18:36

35 votes

Why doesn't Earth appear smudgy or blurred in space photographs due to its fast rotation?

answered Feb 20, 2017 at 13:37

35 votes

Accepted

Is it possible to estimate the speed of a passing vehicle using a musical ear and the doppler effect?

answered Jul 16, 2017 at 0:44

34 votes

Accepted

What exactly makes a force conservative?

answered Sep 15, 2017 at 14:05

33 votes

Accepted

What is the unit (dimension) of the 3-dimensional position space wavefunction $\Psi$ of an electron?

answered Aug 3, 2017 at 16:08

28 votes

Gravitational force when standing on an infinite disc

answered Jun 23, 2016 at 15:35

25 votes

Why is this vector field curl-free?

answered Jan 4, 2017 at 15:40

19 votes

"QFT is simple harmonic motion taken to increasing levels of abstraction"

answered Sep 5, 2017 at 1:29

17 votes

Accepted

Why does a critical point exist?

answered Jul 19, 2016 at 17:33

16 votes

Accepted

Euler-Lagrange equations with non-conservative force (example)

answered Jun 30, 2017 at 18:45

15 votes

What does the Moon's orbit around the Sun look like?

answered Jul 5, 2016 at 22:42

14 votes

What is the definition of temperature, once and for all?

answered Jun 5, 2017 at 20:18

12 votes

What is the relation between angular and linear acceleration?

answered Apr 23, 2017 at 14:41

12 votes

How is entropy a state function?

answered Mar 16, 2017 at 16:59

12 votes

Accepted

How can Newton's idea of absolute space be reconciled with Galilean relativity?

answered Aug 2, 2017 at 12:49

12 votes

Why don't we feel the subtle speed change of Earth's elliptical orbit?

answered Jul 14, 2016 at 17:14

12 votes

Accepted

Change in entropy when mixing water at different temperature

answered Jul 2, 2016 at 13:13

12 votes

Newton's 3rd law... hitting drywall (which I break) vs hitting a brick (which breaks me)?

answered Jul 26, 2016 at 14:34

11 votes

Accepted

Source of Ladder Operators

answered Jan 12, 2017 at 14:35

11 votes

Are light waves sinusoidal functions?

answered Jun 1, 2016 at 17:31

11 votes

Accepted

Are mechanical energy of an element of a rope and energy density constant in the case of mechanical waves?

answered May 20, 2016 at 22:07

11 votes

Why should Conservative forces have their curl equal to zero? (intuition)

answered Apr 16, 2016 at 14:23

11 votes

Accepted

Why the electrons below the Fermi level do not conduct electricity?

answered Jan 28, 2017 at 16:42

10 votes

What is the explanation of the glory (optical phenomenon)?

answered Jan 25, 2017 at 16:04

10 votes

Does Newtonian $F=ma$ imply the least action principle in mechanics?

answered Jul 9, 2017 at 1:35

10 votes

How can transverse waves on a string carry longitudinal momentum?

answered May 23, 2016 at 23:49

10 votes

How can wifi penetrate through walls when visible light can't?

answered Dec 24, 2016 at 12:29

Stack Exchange Network

309 Answers

What makes cheese so effective at absorbing microwaves?

Why is Helium so hard to liquify?

How did Rutherford conclude that most of the mass (as well as the positive charge) was concentrated in the nucleus?

Why gold is always measured with a balance and not with a scale?

Why doesn't Earth appear smudgy or blurred in space photographs due to its fast rotation?

Is it possible to estimate the speed of a passing vehicle using a musical ear and the doppler effect?

What exactly makes a force conservative?

What is the unit (dimension) of the 3-dimensional position space wavefunction $\Psi$ of an electron?

Gravitational force when standing on an infinite disc

Why is this vector field curl-free?

"QFT is simple harmonic motion taken to increasing levels of abstraction"

Why does a critical point exist?

Euler-Lagrange equations with non-conservative force (example)

What does the Moon's orbit around the Sun look like?

What is the definition of temperature, once and for all?

What is the relation between angular and linear acceleration?

How is entropy a state function?

How can Newton's idea of absolute space be reconciled with Galilean relativity?

Why don't we feel the subtle speed change of Earth's elliptical orbit?

Change in entropy when mixing water at different temperature

Newton's 3rd law... hitting drywall (which I break) vs hitting a brick (which breaks me)?

Source of Ladder Operators

Are light waves sinusoidal functions?

Are mechanical energy of an element of a rope and energy density constant in the case of mechanical waves?

Why should Conservative forces have their curl equal to zero? (intuition)

Why the electrons below the Fermi level do not conduct electricity?

What is the explanation of the glory (optical phenomenon)?

Does Newtonian $F=ma$ imply the least action principle in mechanics?

How can transverse waves on a string carry longitudinal momentum?

How can wifi penetrate through walls when visible light can't?