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It is known that a vertical force of 800 N is required to remove the nail at C from the board

Civil Engineering

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It is known that a vertical force of 800 N is required to remove the nail at C from the board. As the nail first starts moving, determine a) the moment about B of the force exerted on the nail, b) the magnitude of the force P which creates the same moment about B if alpha = 10 degrees, c) the smallest force P which creates the same moment about B.