A 7-lb block is suspended from a spring having a stiffness
Chapter 22, Problem 22-65(choose chapter or problem)
A 7-lb block is suspended from a spring having a stiffness of k = 75 lb>ft. The support to which the spring is attached is given simple harmonic motion which may be expressed as d = (0.15 sin 2t) ft, where t is in seconds. If the damping factor is c>cc = 0.8, determine the phase angle f of forced vibration.
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