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Top Questions

15 votes
9 answers
9k views

Can a balloon start from Earth and fly to the Moon, using Helium for lift to the top of the atmosphere and then as propellant?

61 votes
1 answer
5k views

Why doesn't a nucleus-like body made up of just neutrons exist?

17 votes
5 answers
6k views

How does it make sense for the universe to have started from a big bang?

8 votes
3 answers
3k views

Can Jupiter turn into a star if it radiated off enough heat?

10 votes
2 answers
2k views

Why were sparks created in Rutherford's alpha particle scattering experiment?

8 votes
2 answers
1k views

Failure of Newton's corpuscular theory and success of photon theory of light

4 votes
3 answers
2k views

Will a light come back within finite years?

9 votes
3 answers
1k views

Physics of the convection oven

5 votes
3 answers
1k views

Where does all the energy in black holes go?

4 votes
2 answers
205 views

Why would black hole rip me apart?

6 votes
5 answers
317 views

What are some household sources of radiation detectable with a geiger counter?

5 votes
2 answers
405 views

What does it mean if the Fermi level crosses into the valence band? How about into the conduction band?

6 votes
1 answer
556 views

Why are radio telescopes in orbit radio telescopes?

3 votes
2 answers
186 views

How does $s$ subshell not have a node in the center despite the nucleus being there?

6 votes
1 answer
298 views

What does the exponentiated generator of scale transformation do when it acts on a function? [duplicate]

6 votes
1 answer
687 views

How could any frame of reference be inertial?

2 votes
3 answers
204 views

Physical interpretation of mathematical operations

2 votes
3 answers
225 views

Null conserved angular momentum

4 votes
2 answers
223 views

About the non-intuitive announcement at 12 May 2022 of the EHT team that spin axis of Sgr A* Black Hole facing Earth?

9 votes
1 answer
257 views

Resolution of the identity of operator with mixed spectrum

1 vote
2 answers
129 views

Is it possible the Black Holes to be pure deformations in the fabric of spacetime and not an effect of super-dense matter?

4 votes
2 answers
112 views

Essential self-adjointness of the kinetic energy operator

3 votes
1 answer
128 views

Problem understanding expectation value of operators defined with density operator in quantum mechanics

2 votes
3 answers
126 views

How does the combination of lens create a sharper image?

0 votes
1 answer
76 views

How much does the sky weigh? [closed]

0 votes
5 answers
95 views

Question regarding kinetic energy of a body

0 votes
4 answers
101 views

Doubt on photoelectric effect

2 votes
4 answers
78 views

Does the standing wave equation proof require $\ell=Nλ$?

1 vote
2 answers
119 views

What does the $B$ field refer to?

0 votes
3 answers
160 views

Does the vacuum really have infinite energy density?

0 votes
2 answers
55 views

Can quantum fields be artificially excited?

3 votes
3 answers
113 views

Does existence of an analytic solution to an equation of motion given by Newton's second law depend on coordinates?

3 votes
1 answer
85 views

How can light penetrate gold in an astronaut's visor?

0 votes
5 answers
131 views

Is there consensus among physicists that reality is fundamentally deterministic? [duplicate]

6 votes
2 answers
124 views

Dropping a mirror into a blackhole

3 votes
1 answer
91 views

Why is it so much harder to keep the same room cool than to keep it warm?

0 votes
3 answers
62 views

A question regarding equations of motion

9 votes
1 answer
102 views

Is there any end to the electromagnetic spectrum? [duplicate]

-2 votes
2 answers
126 views

What is the component of gravity other than curvature?

0 votes
1 answer
75 views

Would a grounded copper heat sink located near a room's ceiling be an effective way to reduce a room's temperature?

0 votes
2 answers
95 views

How do we figure out what is the right geometry of space?

3 votes
2 answers
80 views

Why does the trajectory of a relativistic particle "minimises its Minkowski distance"?

0 votes
4 answers
61 views

How can beta decay change elementary particles?

0 votes
2 answers
99 views

Helicopter hover flight question

5 votes
2 answers
126 views
+50

Linear Momentum in General Relativity

2 votes
2 answers
73 views

EMF being equal through KVL

2 votes
2 answers
90 views

Proof of principle of stationary action when the Lagrangian is not $L=T-V$


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