Bertrand Russell's Dictionary of Mind, Matter and Morals by Bertrand Russell

Author:Bertrand Russell [Russell, Bertrand]
Language: eng
Format: epub
Publisher: Philosophical Library/Open Road
Published: 2013-10-10T16:00:00+00:00

MASS

When we substitute space-time for time, we find that the measured mass (as opposed to the proper mass) is a quantity of the same kind as the momentum in a given direction; it might be called the momentum in the time direction. The measured mass is obtained by multiplying the invariant mass by the time traversed in traveling through unit interval; the momentum is obtained by multiplying the same invariant mass by the distance traversed (in the given direction) in traveling through unit interval. (ABCR 152)

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