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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

960_A spool of thin wire rotates without friction about its axis.gif

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.)  

62_A spool of thin wire rotates without friction about its axis1.gif

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