A cockroach of mass m lies on the rim of a uniform disk of mass 6.00 m that can

Question

A cockroach of mass m lies on the rim of a uniform disk of mass 6.00 m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.210 rad/s. Then the cockroach walks half way to the center of the disk.

(a) What then is the angular velocity of the cockroach-disk system? (rad/s)

(b) What is the ratio K/K0 of the new kinetic energy of the system to its initial kinetic energy?

(c) What accounts for the change in the Kinetic Energy? (Select all that apply)
Centrifugal Force, Centripital Force, Friction, Gravity, Cockroach does neg. work on the disk, Cockroach does pos. work on the disk

Explanation / Answer

http://www.cramster.com/answers-nov-10/physics/angular-velocity-cockroach-mass-lies-rim-uniform-disk_1037853.aspx PLEASE RATE IF HELPFUL.

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