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  1. S

    I Weight of a relativistic particle

    And assuming the box is a perfect thermal insulator (I guess sealed after the gas was heated), is there anyway to tell whether it is a box of x hot gas particles or y cold gas particles?
  2. S

    I Weight of a relativistic particle

    Well, more specifically, I'm asking whether or not the effect that was once referred to as a the deprecated term "relativistic mass" is indistinguishable from rest mass in certain situations such as the one I described above. I understand that there are legitimate reasons for defining rest mass...
  3. S

    I Weight of a relativistic particle

    If I were able to accelerate a particle to relativistic speeds, then capture that particle in a box in such a way that it kept its speed, then weighed that box, would it weigh more than the box + rest weight of the particle? Would it exert a gravitational field greater than that of the box with...
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