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The angular speed required to store 3.2x10^7 J of energy in a flywheel of radius 0.60 m and mass 400 kg is approximately 8.2 rad/s.
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 10^7 J of energy. Suppose one tried to store this much energy in a spinning solid cylindrical flywheel which was then coupled to the wheels of the car. A large flywheel cannot be spun too fast or it will fracture. If one used a flywheel of radius 0.60 m and mass 400 kg, what angular speed would be required to store 3.2x10^7(Incidentally, 2500 rpm is about the maximum feasible rate of revolution with present materials technology for such a flywheel
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