Flywheels are large, massive wheels used to store energy. they can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. an industrial flywheel has a 1.8 m diameter and a mass of 230 kg . its maximum angular velocity is 1500 rpm .a) a motor spins up the flywheel with a constant torque of 50 nm. how long does it take the flywheel to reach top speed? b) how much energy is stored in the flywheel?