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Results tagged with special-relativity
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user 334925
The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.
1
vote
What is time dilation really?
Well, unfortunately I cannot comment @Rennie, but I'd like to add to the otherwise fine answer of John Rennie that it isn't right to say that:
the quantity d$s$ is called the proper distance
Because …
2
votes
Shouldn't length contraction cause friction under certain circumstances?
I don't think it's all that complicated.
Let’s assume that in your train problem there is a rack and pinion action between the train wheels and the track instead of friction.
Assume that the speeding …
- 41
0
votes
How to derive $E=mc^{2}$?
There are lots of ways (as one can see) to derive $E=mc^2$.
The simplest of all is as follows:
Imagine a stationary box in space. On one end there is a lightsource emitting a photon. Photons have mome …
- 41
1
vote
How to understand $E=mc^2$?
It's very easy to understand $E=mc^2$.
All Einstein's very short paper on the subject, with the English translated title "Does The Inertia of a Body Depend on Its Energy Content?", sais is that $E=mc^ …
- 41
1
vote
What was Albert Einstein's proof for $E=mc^2$?
I agree with Ron completely and wouldn't recommend "studying" Einstein's original papers about it. It's old fashioned and is explained much more accessible nowadays.
Also there's a whole history behin …
- 41
0
votes
In special relativity, what is "now" for people who are very far apart?
To really understand what Brian Greene is actually doing (a bit misleading, imho), you need to understand what spacelike, lightlike and timelike mean in relativity.
What he's actually doing is slicin …
- 41