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Abstract - We present a simple example in which the importance of the inertial effects is evident. The system is an insulating solid narrow disk whose faces are uniformly charged with equal charges of equal magnitude and opposite signs. The motion of the system in two different directions is considered. It is shown how the contribution of energy and momentum of the stress that develops inside the solid to balance the electromagnetic forces have to be added to the electromagnetic contributions to obtain the results predicted by the relativistic equivalence of mass and energy.

We consider a rigid body that is moving in uniform tranlation (velocity v) in the direcction of increasing x-coordinate of a coordinate system (x, y, z) that is assumed to be at rest. If external forces do not act upon it, then, according to the theory of relaivity, its kinetic energy is given by the equation[math]K_0 = \muV^2[\frac{1}{\sqrt(1 - (v/V)^2)} - 1][/math]where [math]\mu[/math] denotes mass (in the conventional sense) and V the velocity of light in vacuum. We now want to show that according to the theory of relativity thi expression does not hold any longer if the body is acted upon by external forces that balance each other.[

Hi Everyone! I'm back!

I had a change of heart. Why? Do you want me to leave?

If development of physics uses relativistic mass then relativistic mass is useful.We would like to see such development.

Certainly not! I was just yanking your chain. A rather low form of humor, I admit.