To drive a typical car at 40 mph on a level road for one hour requires about
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Question:
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 107 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 3.2 ×107 J (Incidentally, 2500 rpm is about the maximum feasible rate of revolution with present materials technology for such a flywheel.)
a. 943 rad/s
b. 530 rad/s
c. 1800 rad/s
d. 3620 rad/s
e. 5470 rad/s
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