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cloveb cloveb
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6 years ago
100-kg thin circular hoop has radius 2 m. Its angular velocity decreases from 20 rad/s to zero in 200 s due to friction. What is the frictional torque acting on the hoop?

(1) 40 N-m (2) 20 N-m (3) 16 N-m (4) 27 N-m (5) None of these.

PHY2053, Summer 2012 Exam
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