All Questions
Tagged with spacetime inertial-frames
290
questions
0
votes
6
answers
173
views
If time runs slow for moving train, how can it cover same distance in less time than someone on the ground unless the track decreases in its view?
According to special relativity,
Δt=γ*Δt' ... (1)
Where,
Δt is the time the train takes to completely pass by me according to my watch,
Δt' is the time I should see has passed for someone on the train....
-2
votes
4
answers
163
views
Relativity of simultaneity in flat spacetime
In Einstein’s (1917) thought experiment on the relativity of simultaneity…
The lightening flashes at A and B are both equal distance from the center of the train and the center of the platform.
The ...
- 27
1
vote
1
answer
174
views
Homogeneity of space doubts [duplicate]
This question might have been asked so many times, but here we go again. I'm wondering what homogeneity of space means. All the descriptions say:
there's no special point in space, every point looks ...
-1
votes
3
answers
104
views
Why doesn't Galilean relativity lead to a contradiction in SR?
Two identical spaceships commanded by Alice and Bob are at rest next to each other in outer space. The clocks of the spaceships are synchronised; and when they are close by Alice can see Bob's clock ...
- 99
0
votes
1
answer
54
views
Can we see the rest-energy of a mass as its kinetic energy in the $ct$-direction?
A mass $m$ at rest has an energy $E=mc^2$. Can we say this is its kinetic energy in the $ct$-direction?
- 450
-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 &...
-1
votes
2
answers
86
views
Problem with deriving the Lorentz Contraction [duplicate]
I am trying to prove the contraction. I know there are several ways one can do it. The way I am trying to solve is said to be complicated and that there is an easier way to do so. Because I don't have ...
- 1,398
0
votes
1
answer
143
views
Lorentz Transformations derivation
I was reading derivation of Lorentz transformation but I don't understand why the constant a here is equal to -c^2.
Full pdf: http://www2.physics.umd.edu/~yakovenk/teaching/Lorentz.pdf
- 3
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
1
vote
1
answer
45
views
Alternative to Susskind's way to derive the equation of the $x'$ axis in relativistic spacetime diagram?
Note : sorry for the poor drawing above.
Note : in what follows, the speed of light is taken as unit : $c =1$ and the trajectory of a light signal sent from $(0,0)$ is $x = ct = t$.
In his ...
0
votes
2
answers
95
views
The Lorentz factor $γ$, and Fermilabs derivation of it
Before diving into my question, we first must acknowledge Einsteins two assumptions:
The laws of physics are the same for every observer and reference frame.
The speed of light is constant for ...
- 39
3
votes
3
answers
221
views
Please explain $E = γmc^2$ more intuitively [closed]
My name is Shaun and I am 14 years old.
Lately I have been trying to learn about $E = mc^2$, and I came across Fermilabs video about $E = γmc^2$, where $γ$ is the Lorentz factor.
My question is how ...
user358599
0
votes
2
answers
69
views
Ambiguous special relativity between two sources?
I am currently confused about things I read about special relativity (I'm a CS major and not as well-versed in physics as I would like to be).
I just watched a video on evaluating a Lorentz ...
- 13
23
votes
7
answers
5k
views
Is there a *geometric* explanation for why photons have no rest frame?
I've read the various threads on this site that talk about it being impossible for photons (or massless particles in general, really) to have a rest frame, and the answers all seem to boil down to &...
- 2,327
0
votes
0
answers
51
views
Geometric definition absolute velocity in affine spaces
currently I am reading the following paper by Halvorson and Clifton (https://arxiv.org/abs/quant-ph/0103041) where they try to argue that localizable particles are inconsistent with relativistic ...
- 21