Some European trucks run on energy stored in a rotatingflywheel, with an electric motor getting the flywheel up to its topspeed of 200rad/s. One such flywheel is a solid, uniform cylinder with a massof 450 kg and a radius of 1.3 m.
(a) What is the kinetic energy of the flywheel after charging?
J
(b) If the truck operates with an average power requirement of10.0 kW, for how many minutes can itoperate between chargings?
min