. The external and internal radii of a friction clutch of disc type are 120 mm and 70 mm respectively. Both sides of the friction clutch are effective and co-efficient of friction is equal to 0.25. The friction clutch is used to rotate a machine from a shaft which is rotating at a constant speed of 320 r.p.m. The moment of inertia of the rotating parts of the machine is 5.5 kg m2 . The intensity of pressure is not to exceed 80,000 N/m2 . Assuming uniform wear, determine the time required for the machine to attain the full speed when the clutch is suddenly applied. Also determine the energy lost in slipping of the clutch.
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