"Alexander Whiteside" wrote in message
...
Don't you mean "turn it into a speed"? Rotations per minute don't tell you
much about the velocity of something. Something 2m wide spinning at 1000 RPM
will have different parts of it moving at different speeds.


The OP proposed a value for the radius of the electron.
Presumably he also implied that the electron is a
spherical particle.

The intrinsic angular momentum of the electron is known
to be L = h/(4pi), or about 5.27x10^-35 kg-m^2/sec.

The moment of inertia of a uniform sphere of mass M and
radius r spinning about an axis is

I = (2/5)M*r^2

For the electron with mass M = 9.11x10^-31 kg and the
OP's radius, this yields I = 8.19x10^-75 kg-m^2.

If w is the angular velocity of the rotating sphere, then
we have the angular momentum L:

L = I*w

so that w = L/I and the tangential velocity at the equator
of the sphere is v = rxw.

w = L/I = 6.44x10^39 Hz

rxw = 9.66x10^17 m/sec

That's waaay faster than light.