A merry-go-round rotates at the rate of 0.15 rev/s with an 80-kg man standing at a point 2.0 m from the axis of rotation.
(a) What is the new angular speed when the man walks to a point 0.7 m from the center? Assume that the merry-go-round is a solid 25-kg cylinder of radius 2.0 m.
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/sec

(b) Calculate the change in kinetic energy due to this movement.
Your response differs from the correct answer by more than 10%. Double check your calculations. J

How do you account for this change in kinetic energy?
Work is done by the merry-go-round on the man as he moves towards the center.
The moment arm of the man about the axis of rotation decreases.
Wind resistance varies as the square of the speed.
Work is done by the man on the system as he moves towards the center.