a) I omegai = I omegaf
b) Do 1/2 I omegai^2 and 1/2 I omegaf^2 and compare
You stand on a frictionless platform that is rotating with an angular speed of 3.9 rev/s.Your arms are outstretched, and you hold a heavy weight in each hand. The moment of
inertia of you, the extended weights, and the platform is 7 kg · m2. When you pull the weights in toward your body, the moment of
inertia decreases to 5.2 kg · m2.
a)What is the resulting angular speed of the platform?
Answer in units of rev/s.
b)What is the change in kinetic energy of the system?
Answer in units of J.
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