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Attached to each end of a thin steel rod of length 1.00 m and mass 6.70 kg is a small ball of mass 1.10 kg. The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint. At a certain instant, it is rotating at 39.0 rev/s. Because of friction, it slows to a stop in 32.0 s. Assume a constant frictional torque.

(b) Compute the retarding torque due to friction.

(c) Compute the total energy transferred from mechanical energy to thermal energy by friction.

(e) Compute the number of revolutions rotated during the 32.0 s.

Then I am told to calculate the mechanical energy loss, which we have never done.