All Questions
Tagged with relative-motion special-relativity
148
questions
-1
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1
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101
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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
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4
answers
83
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How can we tell if a charge is moving in a Magnetic Field?
In the equation $\vec F=q\vec v×\vec B$ ($\vec B$ is the magnetic field), what is $\vec v$ with respect to?
If we were to imagine $\vec B$ to be infinitely large. How could we tell if the charge is ...
- 11
1
vote
2
answers
184
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Very basic special relativity (relative velocities)
My question involves broadly why calculating different (Einstein) relative velocities give different answers:
Say we have car 1 traveling in front of car 2. Car 1 goes at velocity $3c/4$, while car 2 ...
- 111
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votes
2
answers
83
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Do time dilation affects motion? [closed]
I know it doesn't but why not? Imagine when time dilation becomes Infinite then everything will stop or not? What will happen to a ball which hypothetically move at the speed of light so that space ...
- 483
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0
answers
45
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Speed of one frame with respect to another in special relativity [duplicate]
To derive the Lorentz transformation we begin with the general relationship between two frames as below:
$x' = Ax + Bt$
$y' = y$
$z' = z$
$t' = Cx + Dt$
If frame $S'$ is moving at speed $v$ with ...
- 1,270
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1
answer
39
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${}$Reference frames [duplicate]
Most of the particles have different velocity in different reference of frames but why is speed of light the same in all refrence frames? After all light is made of a photon.
0
votes
2
answers
86
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What do you think of the idea of measuring macroscopic Special Relativistic-kinematic time dilation by placing atomic clocks onto moving dollies?
We first attempt to synchronize two stationary clocks placed apart, and we assume we succeed using the Einstein synchronization convention.
Then, we run a third clock along a dolly at a constant speed....
- 11
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votes
1
answer
75
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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
1
answer
31
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Does the magnitude of heat energy given or taken the same in any reference frame
So the question consists of two parts-
The random motion of the particles is equivalent the amount of heat energy. The velocity of collective motion does not result in heat energy. For example take ...
- 2,797
-2
votes
2
answers
210
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Calculating unknown Relative Velocity from Given 2 Known Relative Velocities for speeds comparable to speed of Light
Dear fellow physics lovers,
Given 3 objects A, B and C, travelling with relative velocities such that
$\vec{v_{AB}}$ = Velocity of Object A with respect to Object B
$\vec{v_{BC}}$ = Velocity of Object ...
- 73
2
votes
1
answer
184
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Magnitude of relative velocity between two frames in special relativity
It seems to be taken trivially, and it is indeed intuitive, that the relative velocity $v$ of some frame $O$ with respect to $O'$ is the same in magnitude to the relative velocity of $O'$ with respect ...
- 1,038
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votes
2
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335
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Relative speed of galaxies in deep space
Let say we observe two galaxies, one little bit closer to us than the other one. If we calculate the speed of the farther one does it mean that according to the Hubble law when the closer one reaches ...
- 2,255
3
votes
4
answers
2k
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Does Relativity make a difference on whether Earth revolves around the Sun or not?
According to the theory of relativity there is no ultimate preferred frame of reference in our universe. It means that whenever there is motion between object A and object B, whether it is considered ...
- 157
0
votes
0
answers
55
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Spinning observer inside a solenoid paradox?
It is well known that magnetic fields are frame dependent, with an observer travelling parallel to a moving point charge experiencing no field.
Similarly for a solenoid, a stationary observer on the ...
- 182
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votes
5
answers
972
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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 ...
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