A 68-kg commuter rides on an 8.1-kg bicycle. Each bicycle wheelis a hoop of radius 33 cm and mass 1.4 kg. (a) What energy mustthe biker supply to move at 7.2 m>s? Include the kinetic energyof the biker, the kinetic energy of the bike frame, and the kineticenergy of the rotating wheels. (b) What percentage of the energyshe expends goes into the rotation of the wheels? (c) What percentage goes into her own kinetic energy?

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