The rotor within a generator has a moment of inertia of 400 kg m² and is rotating at 20 rad/s. The rotor is brought to rest over 10 seconds, at a constant angular acceleration. What is the magnitude of the torque that is being applied to the rotor over this interval?
400 Nm
20 Nm
8000 Nm
Can't say without knowing the radius of the rotor.
800 Nm