All Questions
Tagged with relative-motion special-relativity
148
questions
-4
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2
answers
64
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What effect would relativity have for an objective with absolutely no momentum? [closed]
I know as you near the speed of light time slows down and mass increases to near infinite. What I'm curious about is what would happen if an object lost all momentum. No movement at all not even the ...
2
votes
3
answers
65
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If an observer was trapped in a closed box with no way to interact with the external surroundings how will he know if he is moving or at rest [duplicate]
I am a high-school student. Recently we learned the concepts of relative motion and velocity. The idea that anything in motion can subsequently be at rest depending on the frame of reference ...
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-2
votes
1
answer
89
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Photon shot in opposite direction of spaceship, what is its relative velocity? [duplicate]
Okay, lets say you have frame S which is a spaceship who is travelling with speed v = c/3 relative to S' which is some planet Y. In the spaceship two photons are shot in opposite direction, to the ...
- 1,312
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1
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78
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Calculating relative velocity: What am I doing wrong? [closed]
There are two objects A and B. Points P1, P2, P3 are in the same line, and P2 is exactly at the middle of P1 and P3
Suppose B is moving at constant velocity along the line P1 to P3. Thus, time taken ...
- 141
16
votes
7
answers
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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. ...
- 141
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1
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53
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Determining the time elapsed between two events in
I want to determine the time a photon needs in order to cover a distance, say $l_0$, where $l_0$ is the length of a spaceship (reference system S'). So, the photon is going from one end of the ...
- 6,112
16
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3
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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 ...
- 422
1
vote
0
answers
74
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Coordinate transformation and absolute motion in general relativity
In special relativity, all motion is relative. But in the presence of black hole, all motion is with respect to black hole. The curvature of spacetime depends on how far we are away from the black ...
- 134
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1
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Special-Relativity and how things not accelerating appear to be the same in all frames of reference [duplicate]
As someone who knows very little special-relativity (and none of the math) I understood that if you take a car moving down the road (at constant velocity) and approaching an observer, there is no ...
- 107
1
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0
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Attempting to solve the twin paradox without acceleration
My teacher told me that the key to solve the twin paradox is acceleration of the one that travel away. However, I feel a little bit uncertain that time change significantly by just a slightly nudge of ...
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2
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1k
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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 ...
- 2,093
0
votes
3
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69
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Time Dilation and Spinning Reference Frames
If a spaceship approaches a rapidly spinning planet, would the planet's inhabitants , the inhabitants of the planet where the spaceship came from , and the spaceship's occupants observe time dilation ...
- 2,083
0
votes
1
answer
102
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How does one interpret the relative motion of an object in orbit as it compares to to the object it is orbiting?
How does one interpret the relative motion of an object in orbit as it compares to to the object it is orbiting?
In flat spacetime, it's pretty easy to determine relative motion. If Alice sees Bob as ...
- 1
1
vote
3
answers
135
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Rotating Reference Frames And Their Phenomenon
In a rotating reference frame, while observing the proper motion of stars due to your spin, would you perceive time dilation when closely observing those stars?
- 268
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1
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48
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Is it possible to detect your speed relative to light? [duplicate]
Let’s take two cases: (1) your velocity is constant and (2) you are accelerating.
(1) isn’t the answer no, like that’s a core idea of Einstein’s relativity stuff?
(2) I don’t know.
- 207k