How to calculate frequency of vibrations/sec for a unbalance rotor?

For example one rotor of radius 1.5cm with 50mg heavy spot on its surface running at 10000 and then 20000rpm, how to calculate centrifugal force due to heavy spot and vibrations per second on both speeds due to this static unbalance?

Answer:
your centripital force will be

F = m*r*omega^2

Make sure you convert RPM to rad/s.

I believe your frequency will just be freq = omega/(2*pi)

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