Apassenger bus in zurich, switzerland derived its motive power from the energy stored in a large flywheel. the wheel was brought up to speed periodically, when the bus stopped at a station, by an electric motor, which could then be attached to the electric power lines. the flywheel was a solid cylinder with a mass of 1070 kg and a diameter of 1.70 m ; its top angular speed was 2970 rev/min . 1. at this angular speed, what is the kinetic energy of the flywheel? 2. if the average power required to operate the bus is 1.89