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4-65. The A-frame is being hoisted into an upright position by the vertical force of F = 80 lb. Determine the moment of this force

4-65. The A-frame is being hoisted into an upright position by the vertical force of F = 80 lb. Determine the moment of this force about the y axis when the frame is in the position shown. x A 3 ft 30 3 ft 15 B 6 ft

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