Physics
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dmckee --- ex-moderator kitten
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1,532 Answers

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125 votes
Accepted

What is a field, really?

121 votes

Am I attracting Pluto?

79 votes
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Why can't energy be created or destroyed?

77 votes
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Nuclear Fusion: Why is spherical magnetic confinement not used instead of tokamaks in nuclear fusion?

60 votes

How can a black hole produce sound?

54 votes
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Why do physicists assume that dark matter is weakly interacting?

54 votes
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Why is the ampere a base unit and not the coulomb?

52 votes
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How did physicists know that there are two kind of charges?

52 votes
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Why is a laserpointer able to "erase" a glow-in-the-dark sticker?

51 votes

Why do the neutrinos (with mass) from a supernova arrive before the light (no mass)?

46 votes
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Virtual vs Real image

44 votes
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Fundamental question about dimensional analysis

42 votes
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What's the difference between centre of mass & centre of gravity for massive bodies?

41 votes
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Does a photon in vacuum have a rest frame?

40 votes
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Why was the first discovered neutrino an anti-neutrino?

40 votes
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Why is force a vector?

39 votes
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Why do electrons occupy the space around nuclei, and not collide with them?

37 votes

How to learn physics effectively and efficiently

36 votes
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Will 1 gram of matter moving at relativistic speeds completely annihilate a larger quantity of stationary antimatter?

35 votes
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How would an X-ray scanner identify a mirror?

34 votes

How can muons travel faster than light through ice?

33 votes
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Why should the back of a parabolic mirror be painted black?

32 votes

Given that the atomic orbitals are fuzzy, why are the energy levels and energy transitions sharp?

32 votes
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Why is the (free) neutron lifetime so long?

32 votes
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How is the speed of nucleons in the nucleus measured?

32 votes

Could speed of light be variable and time be absolute?

30 votes

In electrostatics, why the electric field inside a conductor is zero?

30 votes
Accepted

What exactly do we see on the famous neutrino image of the sun?

29 votes

Why do spacecrafts take off with rockets instead of just ascending like an aircraft until they reach space?

29 votes

Why is normal force perpendicular?

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