36
Why is there a need for the concept of energy if we have the concept of momentum?
physics.stackexchange.com
35
Why is conductivity defined as the inverse of resistivity?
physics.stackexchange.com
35
When an object crosses a black hole event horizon, does the entire object cross the event horizon "all at once?"
physics.stackexchange.com
35
Are the plates of a battery really charged?
physics.stackexchange.com
34
Why isn't the Doppler effect (for sound waves) symmetric with respect to source and receiver?
physics.stackexchange.com
33
Does special relativity hold for rotating reference frames?
physics.stackexchange.com
33
How can an electron be a point particle but also a wavefunction?
physics.stackexchange.com
33
Why so much kinetic energy inside a proton?
physics.stackexchange.com
32
Why can't the constancy of the speed of light be deduced from classical physics?
physics.stackexchange.com
32
What do black holes spin relative to?
physics.stackexchange.com
32
What happens to an astronaut (with a long rope trailing behind him), when he crosses the event horizon of a black hole?
physics.stackexchange.com
32
Spinning gyroscope loses weight?
physics.stackexchange.com
32
Conversion of mass into energy with 100% efficiency
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31
Where does the curvature of space happen?
physics.stackexchange.com
30
Special Relativity: If speed of light is constant, then why measured lengths and times aren't changing in the same way?
physics.stackexchange.com
30
Flywheel half-way through the event horizon of a black hole vs the equivalence principle
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30
Antennas and relativity
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30
A light problem: What happens when light completely destructively interferes?
physics.stackexchange.com
30
Is energy more fundamental than force?
physics.stackexchange.com
29
Apparent kinetic energy paradox
physics.stackexchange.com
29
Are Newtonian forces real forces or just a useful construct?
physics.stackexchange.com
28
What's exactly the new definition of kilogram, second and meter?
physics.stackexchange.com
28
Is the law of conservation of energy broken by the side-effects of heating and cooling a liquid that evaporates and condenses?
physics.stackexchange.com
28
Is a spontaneous decrease in entropy *impossible* or just extremely unlikely?
physics.stackexchange.com
27
Why is FTL travel impossible if the universe expands FTL?
physics.stackexchange.com
27
What does Einstein mean by “mollusc” in chapter 29 of His book Relativity?
physics.stackexchange.com
27
Intuitively, why do attempts to delay hitting a black hole singularity cause you to reach it faster?
physics.stackexchange.com
26
Can we distinguish between gravity and electrostatic forces interacting on celestial bodies?
physics.stackexchange.com
26
Is the magnetic field really a relativistic effect of the electric field?
physics.stackexchange.com
26
Space falling faster than light after it falls inside the event horizon of a black hole?
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