The 12-kg disk has an angular velocity of = 20 rad/s. If the brake ABC is applied such that the magnitude of force P varies with time as shown, determine the time needed to stop the disk. The coefficient of friction at B is = 0.4.

The 12-kg disk has an angular velocity of = 20 rad/s. If the brake A

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1.	The 12-kg disk has an angular velocity of = 20 rad/s. If the brake ABC is applied such that the magnitude of force P varies with time as shown, determine the time needed to stop the disk. The coefficient of friction at B is = 0.4.
A.	t = 13.00 s
B.	t = 7.00 s
C.	t = 8.92 s
D.	t = 5.08 s
Answer» E.

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