1. The problem statement, all variables and given/known data Here's the problem statement, uploaded onto google docs: http://docs.google.com/View?docid=d277r7r_48f97jqsgs 2. Relevant equations 3. The attempt at a solution i) L=r*p L=R*m*v I think that's the answer, b/c they don't give us any constants to work with, but it seems too easy, so I don't trust myself on that. ii) I=[M(R^2)]/2 iii) Here's where I get really confused. I thought the final moment of inertia would be I+(L/2*pi) because that would be like taking the effect of the ball, and dividing it by the entire circumference of the circle. Does that make sense? iv) The final angular velocity, this is where I'm totally tripped up. I thought it would be v/(answer in iii), because it's like taking v/m in straight kinematics, but translating it to rotational kinematics. Does that make sense again?