Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. The trucks are charged by using an electric motor to get the flywheel up to its top speed of 200? rad/s. One such flywheel is a solid, uniform cylinder with a mass of 650 kg and a radius of 1.5 m.
(a) What is the kinetic energy of the flywheel after charging?
J
(b) If the truck operates with an average power requirement of 7.0 kW, for how many minutes can it operate between chargings?
min