Question: A 10-lb block A rests on a 40-lb plate B which is attached to an un-stretched spring of constant k = 60 lb/ft. Plate B

A 10-lb block A rests on a 40-lb plate B which is attached to an un-stretched spring of constant k = 60 lb/ft. Plate B is slowly moved 2.4 in. to the left and released from rest. Assuming that block A 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.

B k www

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