Video camera in a moving rocket

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    Camera Rocket Video
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Discussion Overview

The discussion revolves around the effects of relativistic speeds on time perception and recording, specifically focusing on a scenario where a camera records a clock inside a box moving at half the speed of light. Participants explore how time dilation might affect the recorded video and the implications for relativity.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant proposes that the camera, moving at relativistic speeds, would record less time than what is perceived on Earth, suggesting a recording of around 51 seconds.
  • Another participant counters that the video would not show a full minute of recording, emphasizing that the camera's recording is tied to the clock it films, not the observer's time.
  • A further participant highlights the importance of light travel time, indicating that the recorded time on the camera would be less than the time shown on an Earth-based watch due to this factor.
  • There is a suggestion that if the camera returns to the observer, it would record the full minute on the clock, but the perceived rate of the clock might not be uniform throughout the recording.
  • Participants express uncertainty about how the recorded video would ultimately appear, particularly in relation to the effects of relativity.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how the recorded video would appear, with multiple competing views regarding the effects of time dilation and light travel time on the recording.

Contextual Notes

Participants note limitations in their understanding of how light travel time affects the recording, and there are unresolved assumptions regarding the synchronization of clocks and the effects of relativistic speeds.

Libor
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TL;DR
how the recording video would look like?
Lets imagine that I will put the recording camera and ticking clock into a box and so that camera can record this clock all the time ticking. I will put then this box to the speed of 1/2 speed of the light, after a minute of mine I would stop this box and take the camera from it. As it was at that speed, the time for camera was slower, I will notice that camera recorded eg. 51 seconds of video, right? On this recorded video however was recorded 1minute of time. What would I see on that video please?
 
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Nearer 52 seconds than 51. Why do you think the video would have a minute of recording? It's just a fancy clock with a memory, so it'll behave the same as the clock it's filming.
 
Last edited:
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Libor said:
... camera can record this clock ...after a minute of mine... recorded 1 minute of time. ...
The camera is recording the clock, not you. Your time is irrelevant to what the camera records.
 
Libor said:
Summary:: how the recording video would look like?
As it was at that speed, the time for camera was slower,
... and the time for clock in the box was slower also.

cf.
Say another camera in the box keep shooting your watch on the Earth through window. The recording show how much time of your watch? It is more than say 52 seconds ? If so it matches with relativity ? I myself do not have a simple way to answer.
 
Last edited:
anuttarasammyak said:
The recording show how much time of your watch?
Less, once you've accounted for the light travel time, since the camera cannot be co-located with your watch. I'd suggest that we should see where the OP takes this before adding complexity to the problem.
 
anuttarasammyak said:
Say another camera in the box keep shooting your watch on the Earth through window. The recording show how much time of your watch? It is more than say 52 seconds ? If so it matches with relativity ? I myself do not have a clear answer on it.
If the camera starts from your location and returns to you, then it will record the full minute on your clock between the meetings. But the rate of your clock as seen on the video might not be uniform.
 
Thank you for the answers
 

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