A 5-lb block A is attached to a spring of constant k = 4 lb/ft and a bar BCD of negligible weight. The bar is connected at D to a moving support E by means of an identical spring. Knowing that the support E undergoes a displacement δ = δm sin ωft where δm = 0.2in and ωf = 10 rad/s determine

(a) The magnitude of the maximum acceleration of block A,

(b) The magnitude of the maximum force transmitted to the support at C.

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3 ft k=4 lb/ft A www.5b D -1 k=4 lb/ft 1.5 ft 5-6, sin ot