Physic help hw Angular acceleration

Question

When a fan performing 10 revolutions per second is switched off, it comes to rest after 10 seconds. Calculate the magnitude of the average angular acceleration of the fan after it was switched off.

Answer 1

Average angular acceleration is total change in angular velocity divided by total time. You can convert revolutions per second to initial angular velocity if you know angular velocity is radians rotated per second and one revolution per second is 2pi radians per second. The final angular velocity is zero, and the total time is given. Feel free to let me know if you have any questions.