Motive power for the experimental 19.0-Mg bus comes from the energy stored in a rotating flywheel which it carries. The flywheel hasa mass of 1510 kg and a radius of gyration of 415 mm and is brought up to a maximum speed of 3940 rev/min. If the bus starts fromrest and acquires a speed of 74 km/h at the top of a hill 54 m above the starting position, compute the reduced speed N of the flywheel.Assume that 9 percent of the energy taken from the flywheel is lost. Neglect the rotational energy of the wheels of the bus. The 19.0-Mg mass includes the flywheel.Answer: N = irev/min

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