Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 200π rad/s. One such flywheel is a solid, uniform cylinder with a mass of 450 kg and a radius of 1.5 m. (a) What is the kinetic energy of the flywheel after charging? 1___________ J (b) If the truck operates with an average power requirement of 10.0 kW, for how many minutes can it operate between chargings? 2 min