The masses of the bar and disk in Problem 21.32 are m = 2 kg and md = 4 kg. respectively....

The masses of the bar and disk in Problem 21.32 are m = 2 kg and md = 4 kg. respectively. The dimensions l = 1 m and R = 0.28 m, and the spring constant is k = 70 N/m.

(a) Determine the angle θe at which the system is in equilibrium.

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(b) The system is at rest in the equilibrium position, and the disk is given a clockwise angular velocity of 0.1 rad/s. Determine θ as a function of time. (See Example 21.2.)