My fault, misread the question...

Of course, spin has nothing to do with actual movement on those scales, and
is more similar to a symmetry function. For example, a king in a deck of
playing cards has a spin of 2, and a sphere has a spin of infinity. Or
something like that, I forget.


"Prai Jei" wrote in message
...
Alexander Whiteside (or somebody else of the same name) wrote in message
thusly:

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.

No, I asked for the speed at the *surface* at the *equator*. That is a
single unique figure for a given spinning sphere, e.g. just over 1000 mph
for the Earth.

Now take it's spin angular momentum (h/4pi), turn that into an rpm and
so
find the surface spin speed at the "equator". You'll find it's many
times
greater than c.

--
Paul Townsend
I put it down there, and when I went back to it, there it was GONE!

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