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

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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 α = 10°, 

(c) The smallest force P which creates the same moment about B.

450 mm 70° 100 шш

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