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If a 1 km long rod of silver was travelling and 99.5% light speed and a current was sent through the rod in the direction of the travel, what would happen to those electrons? Surely they can't travel beyond light speed?

True EO But what I'm wondering about there is what properties one could expect from a infinitely dense material. Would sound treat it as some ideal description of mass? meaning no 'vibrations' between its 'property' at all, or would it really 'vibrate' to sound?

Quote from: Europan Ocean on 12/03/2013 18:02:09If a 1 km long rod of silver was travelling and 99.5% light speed and a current was sent through the rod in the direction of the travel, what would happen to those electrons? Surely they can't travel beyond light speed? rod's speed: Vrelectrons' speed with respect to the rod: Veelectrons' speed with respect to our frame: VV = (Vr + Ve)/(1 + Vr*Ve/c^{2})Example: Vr = 0.995c; Ve = 0.9c (irrealistic in a metal but just as a "gedankenexperiment") --> V = (0.995c + 0.9c)/(1 + 0.995*0.9) =~ 0.9997362c.The equation: V = (Vr + Ve)/(1 + Vr*Ve/c^{2}) is valid for every speed, low or high; try with low speeds and tell me which is the result and the approximating equation.

The rod is travelling at a velocity that is an estimate, ..

..so that the rate of travel of electrons through a silver rod plus the rate of travel of the rod exceeds light speed. The current going forward.

Note: I already gave that reltion above as well as its derivation.