A lo-lb block rests on a 40 -lb plate that is attached to an unstretched spring with a constant of l

Описание: A lo-lb block rests on a 40 -lb plate that is attached to an unstretched spring with a constant of lbift. Plate is slowly moved 2.4 in. fo the left and released from rest. Assuming that block does not slip on the plate, determine (a) the amplitude and frequency of the resulting motion, (b) the corresponding smallest allowable value of the coefficient of static friction between and .