1. A spool of thin wire rotates without friction about its axis. A man pulls down on the wire with force of 13.9N. How long does it take to increase the angular velocity of the spool from 13.0rad/s to 35.0rad/s?
Icm = 0.550kg x m2
Inner radius, r = 0.250m
Outer radius, R = 0.720m
2. 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 0.930kg. 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 0.640m? (Assume there is no energy lost to friction.)
