The 2.75-lb bob of a simple pendulum of length l = 24 in. is suspended from a 3-lb collar...

The 2.75-lb bob of a simple pendulum of length l = 24 in. is suspended from a 3-lb collar C. The collar is forced to move according to the relation xC = δm sin ωf t, with an amplitude δm = 0.4 in. and a frequency ff = 0.5 Hz. Determine (a) the amplitude of the motion of the bob, (b) the force that must be applied to collar C to maintain the motion.

Fig. P19.110