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 = θ₁ 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.

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Given: W = 1500 lb 81 = 60 deg L = 13 ft h = 12 ft a = 7 ft 32.2 2 S B a L