619_Dynamics 11ed Manual

619_Dynamics 11ed Manual - = v A 14.2 ft s = *Problem 18-40...

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Engineering Mechanics - Dynamics Chapter 18 Problem 18-39 The beam has weight W and is being raised to a vertical position by pulling very slowly on its bottom end A . If the cord fails when θ = 1 and the beam is essentially at rest, determine the speed of A at the instant cord BC becomes vertical. Neglect friction and the mass of the cords, and treat the beam as a slender rod. Solve using the conservation of energy. Given: W 1500 lb = 1 60 deg = L 13 ft = h 12 ft = a 7f t = g 32.2 ft s 2 = Solution: 0 W L 2 θ 1 () + 1 2 W g v A 2 W ha 2 + = v A 2 g L 2 sin 1 () ha 2
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Unformatted text preview: = v A 14.2 ft s = *Problem 18-40 The system consists of disk A of weight W A , slender rod BC of weight W BC , and smooth collar C of weight W C . If the disk rolls without slipping, determine the velocity of the collar at the instant the rod becomes horizontal, i.e. = 0 . The system is released from rest when = . Solve using the conservation of energy. Given: W A 20 lb = L 3 ft = W BC 4 lb = r 0.8 ft = 617...
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