The bar has a weight of 6 lb. If the stiffness of the spring is k = 8 lb>ft and the

Chapter 22, Problem 22-73

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The bar has a weight of 6 lb. If the stiffness of the spring is k = 8 lb>ft and the dashpot has a damping coefficient c = 60 lb # s>ft, determine the differential equation which describes the motion in terms of the angle u of the bars rotation. Also, what should be the damping coefficient of the dashpot if the bar is to be critically damped?

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