An electric motor exerts a constant torque of Ï„=10Nâ‹…m on agrindstone mounted on its shaft; the moment of inertia of thegrindstone is I=2.0kgâ‹…m2. If the system starts from rest, find thework done by the motor in 8.0 s and the kinetic energy at the endof this time. What was the average power delivered by the motor?Part A:Suppose we now turn off the motor and apply a brake to bringthe grindstone from its greatest angular speed of 36 rad/s to astop. If the brake generates a constant torque of 13 Nâ‹…m , find thetotal work done (including signs) needed to stop the grindstone.Part A:Suppose we now turn off the motor and apply a brake to bringthe grindstone from its greatest angular speed of 36 rad/s to astop. If the brake generates a constant torque of 13 Nâ‹…m , find thetotal work done (including signs) needed to stop the grindstone.Part B:Find the average power (including signs) needed to stop thegrindstone in Part A.
