All Questions
35
questions
0
votes
1
answer
53
views
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 ...
- 3,992
-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
-1
votes
3
answers
127
views
Any experiment for relative simultaneity?
Any introduction of relative simultaneity usually is like this :
Alice on a train car shines two beams of light towards both ends where two clock are. She sees both clocks see the light at the same ...
- 291
0
votes
3
answers
127
views
Relativity of bodies in motion in space
I have learnt that if we are travelling in space we have no way to tell if we are moving towards something or if it is the something that is moving towards us; to either object they judge that they ...
- 1
-1
votes
2
answers
80
views
Question on Special Relativity regarding light [duplicate]
Mine is a very basic question yet I haven't got a satisfactory answer so I turn to you. Special Relativity is based on two assumptions, one of which is that the speed of light is constant for all ...
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 $c$. ...
0
votes
3
answers
97
views
Why is the speed of near speed of light moving particles not over the speed of light?
I've been looking for an answer to this question for a while now and I've seen the mathematical explanation
$$Vr=[V1+V2]/[1+V1*V2/c²]$$
I understand that the result cannot be greater than $c$ because ...
-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
-1
votes
2
answers
302
views
Why is light speed constant even in respect of a moving body? [duplicate]
My teacher told that speed of light is constant. The speed of moving object appears 0 when seen by another moving object( of same speed as that of first) but she told that light speed is constant ...
0
votes
1
answer
434
views
What is the velocity of a photon with respect to another one? [duplicate]
When light comes from a source, there are numerous photons associated with the energy packets.
Now, what is the velocity of a single photon with respect to another photon coming form the same source i....
-1
votes
1
answer
101
views
Measuring the speed of an object
If I understand correctly someone said (Einstein?) that all motion is relative. However, if it were possible; given that light always travels in a vacuum at a fixed speed, could all other motion be ...
- 719
0
votes
1
answer
75
views
Time dilatation - relative movement
Sorry for eventual factual errors, I am just hobbyist.
A spaceship flies with nearly speed of light away from earth and back.
Time on board were going slower than on earth during flight, so back on ...
- 101
0
votes
2
answers
205
views
What does an observer in a reference frame moving with velocity of light see, when another reference frame with velocity c is launched in opposite? [closed]
Suppose a reference frame is moving with velocity c in +x direction. An observer is there. At any time instance, another reference frame with velocity c is launched in opposite direction, i.e. -x ...
28
votes
11
answers
6k
views
How can any speed be defined as a constant? [duplicate]
We know that the speed of light is a constant, and can therefore be used to calculate many other relative values, but I'm having difficulty understanding how speed can be a constant, seeing as it's ...
2
votes
4
answers
826
views
Why can't we define absolute rest?
If, according to the theory of relativity, as objects gain velocity and approach the speed of light then time for them slows down, why can't we define absolute rest as the inertial frame in which time ...
- 131