Effects of relativistic mass on astronaut

  • #26
pervect
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Not sure what the OP has in mind, but if he answers a few questions it might help. (Or maybe not, but it seems like a start).

1) Is relativistic mass the property of an object, or does it depend on both the object and the choice of a reference frame?
2) What is the velocity of an object in a reference frame in which it is at rest?
3) If the velocity of an object is zero, what is the relationship between its relativistic and rest (and/or invariant) mass?
[add]
4) Is velocity a absolute quantity, or a relative quantity that depends on the reference frame
5) Are there any reasons to prefer one reference frame over another? Or can a problem be worked in any inertial frame you choose?
 
Last edited:
  • #27
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The astronaut inside of the space ship would not feel any difference in mass, time, or any contraction. This is because he is observing and measuring from his frame of reference. From his frame of reference, he is not moving at all but the objects outside of his space ship are zooming past him at 87% the speed of light. They would appear heavier if measured, and would seem to be contracted. It is only to an outside observer would it be that he is heavier if measured and that the space ship and the astronaut have contracted. I hope this helps :)
 

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