ww A 40 lb unform rod AC of length l = 2 ft is attached to a spring of constant k = 5 lb/in at a distance of a = 1.5 ft from a pin a C. (a) If the rod were rotated by a small angle 0 about the vertical position, determine the time period of the resulting oscillations (b) If a force of 2 sin(10t) (lb) () were applied at A, determine amplitude of the steady state response CO