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Q4. A load rope is wrapped around a winch drum of effective diameter 1.2 m to which a brake drum of 900 mm diameter is attached. The drums have a total mass of 200 kg and radius of gyration 450 mm. The coefficient of friction between the brake drum and brake shoe is 0.33.

Calculate EACH of the following:

(a) the force required at the brake shoe to lower a load of 500 kg at constant velocity from the winch drum. (6)

(b) the braking force required to bring the load to rest from a velocity of 1.5 m/s in a distance of 4 m. (10)