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Q7. A 5-tonne turbine rotor has a 400 mm radius of gyration and is running at speed of 3000 rpm. It has a centre of gravity located 1.5 m to the right of its 150 mm bearing and 1 m to the left of its 200 mm bearing. The coefficient of friction between shaft and bearings is 0.0015. Assume there are windage loss.

 Calculate EACH of the following:

(a) The power lost to friction at this speed. (10)

(b) The time taken to come rest when the driving torque is removed. (6)