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47. An object of weight W is dragged along a horizontal plane by means of a force P whose line of action makes an angle

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47. An object of weight W is dragged along a horizontal plane by means of a force P whose line of action makes an angle O with the plane. The magnitude of the force is given by the formula MW P = u sin 0 + cos 0 where u denotes the coefficient of friction. Find the value of 0 that minimizes P

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