Rotational Motion - Physics - Can't figure out 2nd half of problem!?

jessie c

New member
A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. SUppose that after a centrifuge in a medical laboratory is turned off it continues to rotate with a constant angular deceleration for 14.5s before coming to rest.
A. If its initial angular speed was 3150 rpm, what is the magnitude of its angular deceleration?
-- The answer is 3.62 rev/s2

B. How many revolutions did the centrifuge complete after being turned off?


Thanks for the help!
 
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