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From: valls on 21 Jun 2010 07:51 In the 27Sep1905 Einsteins paper where he derives the universal mass- energy relationship from the Conservation Principle of Energy, we can read: H and E are energy values of the same body referred to two systems of co-ordinates (S1 and S2) which are in motion relatively to each other, the body being at rest in S1. Thus it is clear that the difference H-E can differ from the kinetic energy K of the body, with respect to the other system S2, only by an additive constant C, which depends on the choice of the arbitrary additive constants of the energies H and E. Thus we may place H=K+(E+C). Interpreting this text in its 1905 historical context, the last expression is the Conservation Principle of Energy Total Energy (H)=Kinetic Energy (K)+Potential Energy (E+C) Does any reader know in the 1905 context any other kind of energy E (different from the potential one) with an arbitrary additive constant C? Does any reader know in the 1905 context any other expression for the Conservation Principle of Energy different from Total Energy=Kinetic Energy+ Potential Energy? We are using the copy of the paper that can be found in the following link: http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ |