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A weight attached to a spring of stiffness 0.54 KN/m has a viscous damping device. When the weight is displaced and released, the period

A weight attached to a spring of stiffness 0.54 KN/m has a viscous damping device. When the weight is displaced and released, the period of vibration is found to be 1.8 sec and the ratio of consecutive amplitude is 4.2 to 1.0. Determine the amplitude and the phase when a force F(t) = 9 cos 31/ acts on the system.

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