Question

Question 3. As shown in Fig. 3, a thin disk of mass m = 5 kg rotates with a constant angular velocity ₂ = 12 rad/s with respect to arm OA,

which itself rotates with a constant angular velocity ₁ = 40 rpm about y axis. Assume that the arm OA has negligible mass. Determine (a) the angular momentum of the disk with respect to the point O, (b) the moment of couple of the disk system that that represents the dynamic reaction at the point O, and (c) the kinetic energy of the disk system.