A 6-lb homogeneous disk of radius 3 in. spins as shown at the constant rate ω1 = 60 rad/s....

A 6-lb homogeneous disk of radius 3 in. spins as shown at the constant rate ω1 = 60 rad/s. The disk is supported by the fork-ended rod AB, which is welded to the vertical shaft CBD. The system is at rest when a couple M0 is applied as shown to the shaft for 3 s and then removed. Knowing that the maximum angular velocity reached by the shaft is 18 rad/s, determine (a) the couple M0, (b) the dynamic reactions at C and D after the couple has been removed.

Fig. P18.102