Rotational Kinetic Energy: To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 107 J of energy. Suppose we tried to store this much energy in a spinning, solid, uniform, cylindrical flywheel. A large flywheel cannot be spun too fast or it will fracture. If we used a flywheel of diameter 1.2 m and mass 400 kg, what angular speed would be required to store 3.2 × 107 J?
A. 1800 rad/s
B. 3600 rad/s
C. 940 rad/s
D. 530 rad/s
E. 5500 rad/s
Answer: C
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