A ring (mass 2 M, radius 2 R) rotates in a CCW direction with an initial angular speed 1 ω. A disk (mass 4 M, radius 1 R) rotates in a CW direction with initial angular speed 4 ω. The ring and disk "collide" and eventually rotate together. Assume that positive angular momentum and angular velocity values correspond to rotation in the CCW direction. What is the initial angular momentum Li of the ring+disk system? Write your answer in terms of MR2ω. What is the final angular velocity ωf of the ring+disk system? Write your answer in terms of ω.

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.