User Michael

118 votes

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

answered Oct 15, 2013 at 6:10

92 votes

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

answered Oct 29, 2013 at 14:06

86 votes

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Is it really possible to break the speed of light by flicking your wrist with a laser pointer?

answered Jan 4, 2013 at 10:07

50 votes

How can you weigh your own head in an accurate way?

answered Jul 12, 2013 at 13:00

41 votes

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Do glass panes become thicker at the bottom over time?

answered Mar 4, 2013 at 14:32

33 votes

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Why are expressions such as $\operatorname{ln}T$ used in thermodynamics where $T$ is not dimensionless?

answered Dec 31, 2012 at 14:27

27 votes

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Charge conjugation in Dirac equation

answered Jan 4, 2013 at 13:44

26 votes

What would be the effects if Jupiter was to blow up?

answered Mar 27, 2013 at 10:24

25 votes

Mixing of quarks, neutrinos... and leptons?

answered Sep 10, 2013 at 4:31

24 votes

How can neutrinos "beat light"?

answered May 1, 2013 at 4:01

23 votes

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How long until we fall into the Sun?

answered Aug 19, 2013 at 5:00

22 votes

Dirac equation in curved space-time

answered Mar 21, 2013 at 10:53

21 votes

Einstein gravity versus Newton's gravity

answered Mar 21, 2013 at 0:48

20 votes

Origin of electric charge

answered Mar 18, 2013 at 9:22

19 votes

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Can electrons move through vacuum?

answered Mar 18, 2013 at 15:03

18 votes

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?

answered Jan 3, 2013 at 3:02

18 votes

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Why is the velocity on the top of a wheel twice the velocity of its axle?

answered Jan 3, 2013 at 11:19

17 votes

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What is meant by Vacuum?

answered Jul 8, 2013 at 10:08

16 votes

Can someone please derive $T=2\pi\sqrt{l/g}$ or prove it without using calculus?

answered Mar 16, 2013 at 10:32

15 votes

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How do you tell if a metric is curved?

answered Apr 8, 2013 at 14:43

15 votes

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

answered Dec 31, 2012 at 23:15

15 votes

Where does the extra force generated by a lever come from?

answered Oct 25, 2013 at 5:52

14 votes

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What is the highest speed time dilation has been tested?

answered Feb 22, 2013 at 6:30

13 votes

What is $\Delta t$ in the time-energy uncertainty principle?

answered Feb 13, 2013 at 5:06

12 votes

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Entropy and Crystal Growth

answered Feb 20, 2013 at 12:10

12 votes

Solving the diffusion equation

answered Mar 2, 2013 at 11:58

12 votes

Can you lift a basket up while standing inside it?

answered Jun 20, 2013 at 14:20

12 votes

Is propagation of uncertainties linear?

answered Apr 1, 2013 at 0:34

12 votes

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Does anybody know of any good sources that explain (generically) how we form Lagrangians/Actions/Superpotentials for different field content?

answered Mar 12, 2013 at 11:53

12 votes

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Why do we only have complete particle generations?

answered Jul 25, 2013 at 23:51

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183 Answers

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

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

Is it really possible to break the speed of light by flicking your wrist with a laser pointer?

How can you weigh your own head in an accurate way?

Do glass panes become thicker at the bottom over time?

Why are expressions such as $\operatorname{ln}T$ used in thermodynamics where $T$ is not dimensionless?

Charge conjugation in Dirac equation

What would be the effects if Jupiter was to blow up?

Mixing of quarks, neutrinos... and leptons?

How can neutrinos "beat light"?

How long until we fall into the Sun?

Dirac equation in curved space-time

Einstein gravity versus Newton's gravity

Origin of electric charge

Can electrons move through vacuum?

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?

Why is the velocity on the top of a wheel twice the velocity of its axle?

What is meant by Vacuum?

Can someone please derive $T=2\pi\sqrt{l/g}$ or prove it without using calculus?

How do you tell if a metric is curved?

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

Where does the extra force generated by a lever come from?

What is the highest speed time dilation has been tested?

What is $\Delta t$ in the time-energy uncertainty principle?

Entropy and Crystal Growth

Solving the diffusion equation

Can you lift a basket up while standing inside it?

Is propagation of uncertainties linear?

Does anybody know of any good sources that explain (generically) how we form Lagrangians/Actions/Superpotentials for different field content?

Why do we only have complete particle generations?