All Questions
Tagged with special-relativity observers
813
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2
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771
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Is there a different way to measure speed, other than with time?
A second on Earth is different from a second on the Sun and a second next to a black hole. Therefore speed, as measured in meters per second, is different in each of these locations. Is there an ...
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Special Theory of Relativity Contradiction [duplicate]
I’m struggling with an apparent contradiction of special theory of relativity (STR) that I cannot resolve.
Imagine two twins flying by each other in space along the same straight line but in the ...
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2
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Train example of special relativity
My friend Eric is at the center of the train. The train is moving forward. The front end and back end of the train flash a light at the same time. From Eric's perspective, both light arrives at him at ...
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Schutz description of Galilean invariance of interval
In B. Schutz's textbook "A First Course in General Relativity", there is a sentence on page 172 discussing Galilean relativity and how the distance between events is invariant in coordinate ...
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1
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Absolute rest in special relativity
I am new to special relativity and with still little experience in Physics. I would like to know why a privileged frame of reference that determines absolute rest is not possible. I want you to ...
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Can relativity apply to temperature? [duplicate]
Given a stationary observer and a moving one. One would see the particle in a system of gas moving faster than the other would. Does that mean the particles have more kinetic energy and thus higher ...
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6
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Question regarding time dilation
if people in semi-light-speed ships age slower, does the world appeared to those people also 'age slower'? Because it is the external world which is moving at semi-light-speed to the people in the ...
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3
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356
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One-way Tachyonic anti-telephone
When you have length contraction in special relativity
$$L' = L/\gamma$$ the interpretation is that $L'$ is the length of an object with rest-length $L$ moving with respect to an observer at rest. ...
- 1,200
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Confusion regarding Special Relativity and Relativity of Velocity? [duplicate]
Suppose that there are two points in an empty space A and B and observers at A and B having clocks:
If A were to be traveling near speed of light, when clock at A passes 1 hour, observer at A ...
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1
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44
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Relativity - how do you calculate the duration of this trip from various reference frames?
Let's have following scenario:
A spaceship departs from the Earth and constantly accelerates in a straight line for 60 000 000 seconds at 1g (10 m/s^2), then immediately starts decelerating at 1g for ...
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If you have two clocks moving toward each other and they both stop when they meet does it point to a paradox?
Say they both decelerate at the same rate also. If clock A sees clock B as slower than itself and clock B see clock A as slower than itself due to relativity isn't this a paradox because when they ...
- 361
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How would a spacecraft travelling near light speed say 0.9c compensate for time dilation in radio communication from spacecraft to earth?
For a spacecraft travelling at 0.9 c for 5 seconds, only 5 seconds would have passed for an observer on Aircraft, while 26.31 second would pass for a stationary observer watching from Earth.
In a ...
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3
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97
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Question regarding aparent position and velocity of an object
A time lag is always involved while observing objects. Due to this reason we can never observe the correct position of an object at a particular time. We will see it where it was some times ago. Is ...
user380105
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105
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Time observed in a clock when you start moving relative to it
There's an example given by Brian Green, https://www.youtube.com/watch?v=XFV2feKDK9E&t=17675s
To be precise the example start at 04:56:00. In brief it is as follows:
There are two persons Gracie ...
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2
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Does the length of an object change after acceleration in Special Relativity? [duplicate]
In special relativity, an object (a box, perhaps) travelling at 0.5c relative to us, if it thinks it's 1lightsecond long in its own reference frame, will look 0.866 lightseconds long to us.
My ...
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