All Questions
18
questions
-4
votes
2
answers
64
views
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 ...
1
vote
0
answers
73
views
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
0
votes
1
answer
53
views
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 ...
- 1
-1
votes
1
answer
48
views
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.
- 201
0
votes
3
answers
117
views
Details on analyzing relative motion
I have been viewing some videos and reading some articles about Relativity and relative motion. My search abilities seem to be rather lacking. I am looking for articles, questions, and/or forums ...
0
votes
0
answers
72
views
What is the ceiling on the perceived relative speeds of two bodies, from the point of view of a third observer? [duplicate]
What is the ceiling on the perceived relative speeds of two bodies, from the point of view of a third observer's reference frame?
We all know the ceiling on perceived speed relative to oneself is $c$. ...
-3
votes
3
answers
100
views
If I'm moving with almost speed of light but without any acceleration will I see any relativistic effects?
As the moving is relative there is no matter on which speed you are moving if there is no acceleration. We will fill it exactly the same as no moving (if other objects moves with the same speed).
So, ...
- 768
-2
votes
2
answers
445
views
What would an outside observer see if I throw a ball in the opposite direction of the train's movement towards a catcher? [duplicate]
Without taking air resistance into consideration, what would a stationary observer see if I am inside a moving train traveling at 60mph and throw a ball at 60mph opposite the direction of the train? ...
0
votes
5
answers
972
views
Time dilation in a moving frame of reference
According to the theory of relativity, time slows down in a moving frame of reference. But I am confused in the example given below.
Suppose there are two men $A$ and $B$. $A$ is standing in moving ...
user262060
2
votes
2
answers
523
views
Why can't we take space as universal frame of reference?
Suppose we have a ball filled half with water in space with nothing else around (nothing else in the whole space except the ball) and suddenly it accelerates for time t. obviously, there would be ...
1
vote
4
answers
260
views
Relative motion and time
When someone reaches to a speed which is close to the speed of light with respect to earth, will he see the things actually moving faster than when he is in low speeds?
- 23
0
votes
3
answers
447
views
Inside a box moving with constant velocity
Suppose You were put into a box with all the instruments you might require.
The box moves with constant velocity on the surface of the earth.
We are asked to detect inside the box whether we are ...
- 1,037
5
votes
2
answers
438
views
Are my intuitions about special relativity right?
Suppose there is a bus which travels at constant speed $v=0.9c$, relative to my friend Eric who is standing still on the ground.
I'm exactly in the middle of the bus, at distance $d$ form both ends, ...
-1
votes
3
answers
885
views
If two observer don't agree about distance traveled and the Times it takes, why they agree about relative speed?
Lorentz factor depend on speed, but to measure the speed, we need to know the distance traveled and the times it takes to get the ratio. But according to special relativity theory, for two equivalent ...
- 111
3
votes
1
answer
618
views
Symmetry between inertial reference frames
So my textbook says the following - roughly translated - in the context of Special Relativity:
"Assume we have two observers, A and B, moving relative to each other. Observer A measures a velocity ...
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