Re: Inertial modification by rotation

Dear Berndt

Well, according to Einstein's famous E=mc2, it would. An increase in 
internal energy (by rotating discs or more simple by increasing the 
temperature) would slighty increase the mass. It is easy to estimate 
that the change in mass is VERY small under normal circumstances. BUT:
How do you accerate the discs in a CLOSED system ? If you e.g. use 
batteries, their mass is slightly reduced when their are "empty". The total 
energy of a closed system is constant, so is its momentum and its velocity 
(relative to something) if there are no EXTERNAL forces.