All Questions
16
questions
-1
votes
2
answers
116
views
Does special relativity imply that there's such a thing as absolute time, or base time?
If time measured by one observer moving at a greater velocity than another observer is observed to be passing more slowly, does this imply that there's such a thing as "absolute time" or &...
0
votes
1
answer
57
views
What is the reason of different clock's measurements in different frames? [closed]
I tried to understand what is the reason of different clock's measurements in different frames.
For this I looked at easy example with distance S traveled by man with moving clock (velocity V1=2m/s) ...
- 149
2
votes
5
answers
355
views
Special Relativity and Hypersurface of Simultaneity?
In Special Relativity when I move backwards and forwards my hypersurface of simultaneity moves too.
Does time really oscillate backwards and forwards as I move around? Or is it just the application of ...
- 65
1
vote
2
answers
107
views
Temporal Ordering in Special Relativity [duplicate]
Not a physicist: but want to use the temporal ordering of events in special relativity as an example for something, and need to answer the following question to do so.
Suppose we have three events, a, ...
- 11
-2
votes
2
answers
219
views
How can we have motion through time with Relativity? [closed]
How can anything actually move through time if Relativity is correct? It seems everything is just a Lorentz Transformation to a different reference frame and 4D spacetime keeps track of all of these ...
-4
votes
3
answers
203
views
Twins Paradox: Back on Earth, same moment? (and always) [closed]
Supposing twin A, having been on a well-known circular near-light-speed journey, returns to Earth a younger man than twin B.
Let's say A took off at 3pm and upon return has aged 2 hours while B has ...
- 383
10
votes
3
answers
1k
views
Why is absolute time considered an axiom of Newtonian mechanics? What statements are based on this axiom?
I guess absolute time is associated to classical mechanics because people like Newton believed in that concept, but are there actually any statements whose derivation is based on this assumption?
I've ...
- 1,801
0
votes
1
answer
464
views
Can a frame of reference travel with the speed of light? [duplicate]
I read that nothing with mass can travel at the speed of light. Therefor one can not ask what happens when an observer in a car moves with the speed of light. But, is it possible for a frame of ...
- 131
-2
votes
1
answer
39
views
Age of a person going to space [closed]
When a person goes into space and stays there for a specific time without moving the spacecraft, will he age faster than those on earth?
- 11
0
votes
2
answers
464
views
In the twin paradox, can light signals be used between twins to figure out what their proper times were when the light signals were sent?
Einstein used light signals to synchronize clocks in the same reference frame to the same time no matter the distance separation between those clocks to come up with some kind of perspective "present"....
- 460
4
votes
0
answers
297
views
How is time "homogeneous"?
My book$^1$ states:
Let's consider a clock moving freely over a curve such as:
\begin{equation}
\frac{dx^i}{dt}=\text{const} \tag{1.20}
\end{equation}
We define the proper time $\tau$ as the ...
- 740
0
votes
1
answer
140
views
How do photons travel in time? [duplicate]
How can particles such as photons travel in time if they do not have any mass? They are inseparable, so how can you have one but not the other?
- 15
0
votes
1
answer
48
views
Relativity equations
In the equations for time dilation and length contraction, what is a good way of choosing who is the relative time and length and who is the proper time and length so we can get good measurements of ...
1
vote
4
answers
422
views
Why did no one before Einstein realized that time is relative?
If you think about it, it is supposed to be obvious.
It was already proven that the speed of light is constant in all reference frames.
So for the equation $v=x/t$ to be true, when $v$ equals $c $, in ...
0
votes
1
answer
355
views
Does Inertial time dilation demonstrate that Time is not a dimension? [duplicate]
If time is a dimension and 'now' simply an expression of your position with respect to that dimension, the progress of any object along that dimension should remain in step with all other objects. By ...
- 426