A rotating flywheel can be used as a method to store energy. If it has 2.0 × 10^6 J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 Nm acts on the system, in what interval of time would the flywheel come to rest?

a. 3.5 min
c. 14 min
b. 42 min
d. 21 min


B

Physics & Space Science

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