A $200-\mathrm{kg}$ flywheel is at rest when a constant 300 N m couple is applied. After executing 560 revolutions, the flywheel reaches its rated speed of 2400 rpm . Knowing that the radius of gyration of the flywheel is 400 mm , determine the average magnitude of the couple due to kinetic friction in the bearing.
Explanation
The initial angular velocity of the flywheel is calculated using the equation of rotational motion. Then, the average torque due to kinetic friction is found using the moment of inertia and the angular acceleration.
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