Physics
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G. Smith
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1,259 Answers

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77
How is water heavier than petrol, even though its molecular weight is less than petrol?
Jun 3 '19 at 5:07
64
Do photons bend spacetime or not?
May 22 '19 at 2:48
56
Why don't merging black holes disprove the no-hair theorem?
Feb 10 '19 at 23:55
54
Do planets orbiting stars emit gravitational waves?
Mar 24 '20 at 1:37
50
Can an object tethered to a spaceship be pulled out of event horizon?
Aug 27 '19 at 18:55
49
If visible light has more energy than microwaves, why isn't visible light dangerous?
Jan 7 '19 at 5:14
47
Why isn't the GPS location calculated from the Schwarzschild metric?
Nov 21 '18 at 4:56
42
Is the force of gravity always directed towards the center of mass?
Apr 28 '20 at 17:49
39
Is fission/fusion to iron the most efficient way to convert mass to energy?
Jun 11 '19 at 1:47
35
Do black holes move through space?
Mar 1 '20 at 23:06
35
What percentage of the mass/energy of the universe is in the form of electromagnetic waves?
Sep 2 '19 at 4:06
35
Why can’t you see at the start of the Big Bang?
May 6 '19 at 1:34
34
How do photons affect each other gravitationally?
Sep 14 '20 at 6:03
29
Finding how much time it takes for a complete Earth revolution around the Sun
Nov 28 '19 at 18:17
26
Why do gravitational waves circularize a binary?
Mar 2 '20 at 0:40
26
Why is the Sun made of light elements only?
May 9 '19 at 17:01
26
Why doesn't increasing the temperature of something like wood or paper set them on fire?
May 5 '19 at 20:25
25
Why is quantum gravity non-renormalizable?
Jun 30 '19 at 4:06
24
Why don't electromagnetic waves interact with each other?
Apr 7 '19 at 0:26
23
Is there a way to calculate the time taken by a falling object to reach terminal velocity?
Nov 6 '18 at 17:20
22
Why do we not observe a greater Casimir force than we do?
Jan 23 at 18:29
21
What is the physics problem whose answer is $e$ in the power of $\pi$ despite all given numbers being unity?
Feb 26 '20 at 17:52
20
Is there an electric dipole moment in an electron?
Nov 17 '18 at 16:48
19
Is it possible to re-identify a particular electron? are there identity conditions for electrons?
Dec 18 '19 at 18:43
19
Do we or do we not observe (measure) superpositions all the time?
Jun 23 '19 at 7:19
18
What really determins the color of light?
Apr 4 '20 at 4:55
18
What *exactly* is electrical current, voltage, and resistance?
Apr 23 '19 at 1:26
18
Do variations of the Earth's magnetic field affect gravitational acceleration at Earth's surface, and if yes, by how much?
Feb 11 '19 at 6:46
17
Is a single radon-daughter atom in air, such as ${}^{218}\text{Po}$, a solid?
Jun 18 '19 at 16:53
17
Is electric current relative?
Dec 16 '18 at 17:55
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