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11.4) A 30-ft ladder weighing 40-lbf is initially stationary and leaning against a wall with θ 400 when the foot of the ladder begins to slide to the left. Determine the angular acceleration of the ladder and the forces at A and B at the moment slipping begins if the coefficient of kinetic friction between the ladder and all surfaces is k-0.2 2

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418 요12 2 about yl fA Na 32.2 32.2 3ノ o 913 82

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