All Questions
Tagged with relative-motion special-relativity
148
questions
13
votes
5
answers
4k
views
Measure absolute speed
Currently I'm 17 years old, going to secondary school. So, my ideas might be totally wrong...
I know that everything is relative. In the example of speed, the earth moves, and the galaxy moves, etc.
...
0
votes
1
answer
907
views
Galileo's dictum and how light cannot violate it
Okay. So I've been told that the speed of light is constant and cannot violate Galileo's dictum, but even if it weren't constant (in a vacuum), how would it violate it anyway?
Say you are on a train ...
- 1
3
votes
1
answer
992
views
Relative Speed vs speed of light [duplicate]
Possible Duplicate:
Travelling faster than the speed of light
Someting almost faster than light traveling on something else almost faster than light
I've got two questions which are related and ...
- 203
16
votes
3
answers
10k
views
How to derive addition of velocities without the Lorentz transformation?
Lorentz contraction and time dilatation can be deduced without Lorentz transformation. Can you deduce also the theorem of addition of velocities
$$w~=~\dfrac{u+v}{1+uv/c^2}$$
without Lorentz ...
- 1,714
1
vote
1
answer
586
views
What would happen to electronic circuits when traveling near the speed of light?
Imagine a space ship, loaded with all sorts of computer systems, traveling near the speed of light.
Electricity itself is very fast, and can reach speeds close the speed of light. (up to 99% ...
- 757
16
votes
7
answers
11k
views
Is acceleration relative?
A while back in my Dynamics & Relativity lectures my lecturer mentioned that an object need not be accelerating relative to anything - he said it makes sense for an object to just be accelerating. ...
- 1,657
0
votes
1
answer
2k
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In What Frame of Reference does the Special Theory of Relativity Operate? [duplicate]
Possible Duplicate:
Time Dilation - How does it know which Frame of Reference to age slower?
This has bugged me for years.
According to the theory of relativity, the faster an object moves, the ...
- 103
6
votes
2
answers
1k
views
Lorentz force law in Newtonian relativity
I know that in special relativity Electric and Magnetic fields mix together in different reference frames, but my question is about classical mechanics.
It seems weird to me is that the Lorentz Force ...
- 1,075
2
votes
1
answer
994
views
Einstein Relative Motion and Time Order of Events
According to Einstein, do observers in relative motion agree on the time order of all events?
I don't think they would agree on the timing of events, but I am having trouble figuring out why they ...
- 123
3
votes
4
answers
1k
views
How is this classical "paradox" resolved in electromagnetism?
A magnet and a coil move relative to each other. In the frame of reference of the magnet, there is a magnetic field and consequently a force acting on the charges in the coil according to the Lorentz ...
- 1,352
3
votes
2
answers
1k
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Galilean transformation in relativity
Assume flat spacetime in a general relativistic framework (or special relativity for that matter) and two observers $A$ and $B$, with non-vanishing velocity relative to each other. We know that they ...
- 8,523
7
votes
2
answers
400
views
Why absoluteness of time implies galilean transformations?
In Landau course, vol.1 Mechanics, one finds the statement:
...the absoluteness of time necessarily implies that the ordinary law of composition of velocities is applicable to all phenomena.
I ...
- 3,732
4
votes
4
answers
505
views
Chosing a reference frame in which the Earth is at rest and doesn't rotate
We may choose a non-rotating earth as our reference frame and ask ourselves: how about the planetary and stellar motions. A star at a distance of 10 million light years would turn around the earth in ...
- 6,841