Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 200p rad/s. One such flywheel is a solid, uniform cylinder with a mass of 600 kg and a radius of 1.2 m.
(a) What is the kinetic energy of the flywheel after charging?
__________J
(b) If the truck operates with an average power requirement of 8.0 kW, for how many minutes can it operate between chargings?
__________min