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(a) A casting weighing 9 kN hangs freely from a rope which makes 2.5 turns around a drum of 300 mm diameter revolving at

(a) A casting weighing 9 kN hangs freely from a rope which makes 2.5 turns around a drum of 300 mm diameter revolving at 20 rpm. The other end of the rope is pulled by a man. The coefficient of friction is 0.25. Determine the force applied by the man. (5)

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