text: need physics help!? i am stuck on this problem and would be really greatful with any help on it. thanks a bunch!  a carousel 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 carousel is a solid 25-kg cylinder of radius 2.0 m.  answer is in rad/s  (b) calculate the change in kinetic energy due to this movement.  answer is in joules sorry. not that far in physics yet