A cockroach of mass m lies on the rim of a uniform disk of mass 5.00m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.300 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/Ko 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.) O centrifugal force O friction O cockroach does negative work on the disc O centripetal force O gravity O cockroach does positive work on the disc

A cockroach of mass m lies on the rim of a uniform disk of mass 5.00m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.300 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/Ko 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.) O centrifugal force O friction O cockroach does negative work on the disc O centripetal force O gravity O cockroach does positive work on the disc