A spool of thin wire rotates without friction about its axis. A man pulls down o

Question

A spool of thin wire rotates without friction about its axis. A man pulls down on a wire connected to an inner radius with force of 16.3 N. How long does it take to increase the angular velocity of the spool from 15.0 rad/s to 35.0 rad/s? Icm = 0.850 kgm2 Inner radius, r = 0.340 m Outer radius, R = 0.620 m.
Consider the same spool as in the previous problem. Now, instead of pulling on the wire, the man attaches the wire to a mass of 0.880 kg. The man lets go of the mass, and the spool starts to turn. What is the speed of the mass after it has travelled downward a distance of 0.540 m? (Assume there is no energy lost to friction.) I try the answer 1.126m/s but the computer did not accept that answer

Explanation / Answer

a=t/Icm=6.52 35=15+6.52t t=3.067 s

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