A Rotating Flywheel Can Be Used as a Method to Store

question 7

Multiple Choice

A rotating flywheel can be used as a method to store energy. If it has 2.0 * 10⁶ J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 N m acts on the system, in what interval of time would the flywheel come to rest?

• A) 3.5 min
• B) 42 min
• C) 14 min
• D) 21 min

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