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Help with physics impulse problem

  1. Aug 13, 2005 #1
    I just need a little help getting past the first step. I have already converted rpm to rad/sec.

    120 J are done on a fly wheel to raise its speed from 60rpm to 160 rpm. Find its moment of inertia.

    How do I convert 120J to power

    and how do I set up the inertia half
  2. jcsd
  3. Aug 13, 2005 #2
    Think in terms of angular kinetic energy.
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