Question: An 8 . 0 - cmcm - diameter hard disk spinning at 7 2 0 0 rpmrpm can stop in 1 1 revolutions. What is

An 8.0-cmcm-diameter hard disk spinning at 7200 rpmrpm can stop in 11 revolutions.
What is the magnitude of the angular acceleration?
How long does it take the disk to come to a halt?

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