One possibility for a low-pollution
Chapter , Problem 91(choose chapter or problem)
One possibility for a low-pollution automobile is for it to useenergy stored in a heavy rotating flywheel. Suppose such acar has a total mass of 1100 kg, uses a uniform cylindricalflywheel of diameter 1.50 m and mass 240 kg, and should beable to travel 350 km without needing a flywheel spinup.(a) Make reasonable assumptions (average frictionalretarding force = 450 N, twenty acceleration periods fromrest to 95 km/h, equal uphill and downhill, and that energycan be put back into the flywheel as the car goes downhill),and estimate what total energy needs to be stored in theflywheel, (b) What is the angular velocity of the flywheelwhen it has a full energy charge? (c) About how longwould it take a 150-hp motor to give the flywheel a fullenergy charge before a trip?
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