If the electron were a classical solid sphere, with radius [4.138](the so-calledclassical...

If the electron were a classical solid sphere, with radius

 [4.138]

(the so-calledclassical electron radius, obtained by assuming the electron's mass is attributable to energy stored in its electric field, via the Einstein formula E = mc2), and its angular momentum is (1/2), then how fast (in m/s) would a point on the "equator" be moving? Does this model make sense? (Actually, the radius of the electron is known experimentally to be much less than rc, but this only makes matters worse.)