Y. Simon’s scientific contributions

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Publications (1)


Langevin's derivation of the relativistic expressions for energy
  • Article

November 1991

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26 Reads

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8 Citations

American Journal of Physics

Y. Simon

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N. Husson

Langevin showed that the relativistic expression for the kinetic energy, as well as the inertia of energy, could be derived entirely from the principle of conservation of energy, in addition to the two usual postulates of special relativity. Unfortunately, this beautiful derivation, given in a lecture and not published by the author, passed almost unnoticed. The object of this paper is to popularize it in a modernized presentation. Langevin's approach is compared with the well-known one starting from the relativistic law of linear momentum conservation, following an idea of Lewis and Tolman.

Citations (1)


... One might think that it is useless to dig up again the old debate on the relativistic mass (e.g. [1,11,13,19,22,29,32,34,38,41,47]), but sometimes rehashing a little bit the basic equations can lead to interesting ideas. That debate showed that the so-called relativistic mass, composed of the rest (inert) plus the kinetic mass, was a misleading concept. ...

Reference:

Matter without mass: do we really need the concept of mass?
Langevin's derivation of the relativistic expressions for energy
  • Citing Article
  • November 1991

American Journal of Physics