Exam 4 Review.pptx

# Exam 4 Review.pptx - Exam 4 Review Problem 1 One...

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Exam 4 Review

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Problem 1 One possibility for a low pollution automobile is for it to use energy stored in a heavy rotating flywheel. Suppose such a car has a total mass of 1100 kg, uses a uniform cylindrical flywheel of diameter 1.50 m and mass 240 kg, and should be able to travel 350 km without needing a flywheel “spinup.” (a) Make reasonable assumptions (average frictional retarding force = 450 N, twenty acceleration periods from rest to 95 km/h, equal uphill and downhill, and that energy can be put back into the flywheel as the car goes downhill), and estimate what total energy needs to be stored in the flywheel. (b) What is the angular velocity of the flywheel when it has a full “energy charge?” (c) About how long would it take a 150-hp motor to give the flywheel a full energy charge? It does take 1.65 x 108J of stored energy to power the car for a 350 km trip. It takes twenty five minutes to “charge” the wheel with a 150 hp motor and it has
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