To Drive a Typical Car at 40 Mph on a Level

question 35

Multiple Choice

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

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