A 7-lb block is suspended from a spring having a stiffness of k = 75 lb/ft. The support...

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 can be expressed as where t is in seconds. If the damping factor is determine the phase angle 0 of forced vibration.