Assume the frictional torque on the axle (magnitude τf) is independent of speed, and remains the same when the second washer is dropped. (a) What angle does the rotor rotate through during t...Assume the frictional torque on the axle (magnitude τf) is independent of speed, and remains the same when the second washer is dropped. (a) What angle does the rotor rotate through during the collision? (b) What is the work done by the friction torque from the bearings during the collision? (c) Write down an equation for conservation of energy.