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Q9. A 25 kg wheel and shaft runs in horizontal bearings. The shaft is 60 mm in diameter and has a cord wound around it with a hook at its free end. A mass of 0. 7 kg hanging f ram the hook is just sufficient to overcome friction whilst a 4.5 kg mass falls 1.8 min 10 seconds from rest.

Calculate the minimum torque transmitted to the wheel and shaft by the falling 4.5 kg mass. (16)