All Questions
221
questions
4
votes
3
answers
1k
views
storing energy (as mass)
When chemical energy is released mass is reduced, if only by a negligible amount. Presumably that's true for all energy. And presumably that works in reverse as well: storing energy involves an ...
- 375
2
votes
3
answers
2k
views
Is the curvature of space around mass independent of gravity?
Is the curvature of space caused by the local density of the energy in that area?Could gravity be a separate phenomenon only arising from the curvature of space? For instance if the density of energy ...
- 379
4
votes
1
answer
600
views
Is there a theory which treats particles as classical point singularities?
Is there a published theory that looks at all matter as occupying no space and only being felt because of its gravitational pull?
We've been taught in school that matter has mass and occupies space. ...
- 163
0
votes
0
answers
102
views
Masses of all the particles in the Standard Theory [duplicate]
Possible Duplicate:
If photons have no mass, how can they have momentum?
I'm sure this question has been asked here before but I wasn't able to find it clearly answered in one q/a session. I'm a ...
- 151
9
votes
6
answers
44k
views
What is Energy made of?
We have the famous equation $E = mc^2$, and we also believe that matter is made of particles.
Then, What is the energy made of? If the two are interchangeable, there must be some common building ...
- 3,423
2
votes
3
answers
536
views
Mass in terms of energy
Given the relationships between mass and energy in relativity, and given that particles with mass can be created given energy over the threshold energy, and vice-versa, can we say that mass is simply ...
- 1,887
12
votes
3
answers
6k
views
Explain how (or if) a box full of photons would weigh more due to massless photons
I understand that mass-energy equivalence is often misinterpreted as saying that mass can be converted into energy and vice versa. The reality is that energy is always manifested as mass in some form,...
- 21.1k
30
votes
3
answers
19k
views
Does $E = mc^2$ apply to photons?
Photons are massless, but if $m = 0$ and $E=mc^2$, then $E = 0c^2 = 0$. This would say that photons have no energy, which is not true.
However, given the formula $E = ℎf$, a photon does have energy ...
user1313
24
votes
7
answers
10k
views
What is the symmetry which is responsible for conservation of mass?
According to Noether's theorem, all conservation laws originate from invariance of a system to shifts in a certain space. For example conservation of energy stems from invariance to time translation.
...
- 2,080
7
votes
2
answers
218
views
Why did this glass start popping?
I remember a while ago my father dropped a glass lid and it smashed. It looked something like this. When that happened, for about 5 minutes afterwards, the glass parts were splitting, kind of like ...
- 1,432
47
votes
6
answers
8k
views
Do photons gain mass when they travel through glass?
Please correct me if I'm wrong, but I believe that photons slow down when travelling through glass. Does this mean they gain mass? Otherwise, what happens to extra kinetic energy?
I understand now ...
- 1,248