An ice skater is spinning at 5.8 rev/s and has a moment of inertia of 0.56 kg ⋅ m2. Suppose instead he keeps his arms in and allows friction of the ice to slow him to 2.5 rev/s. What is the magnitude of the average torque that was exerted, in N ⋅ m, if this takes 15 s?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter13: Rotation Ii: A Conservation Approach
Section: Chapter Questions
Problem 49PQ: A turntable (disk) of radius r = 26.0 cm and rotational inertia0.400 kg m2 rotates with an angular...
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 An ice skater is spinning at 5.8 rev/s and has a moment of inertia of 0.56 kg ⋅ m2.

Suppose instead he keeps his arms in and allows friction of the ice to slow him to 2.5 rev/s. What is the magnitude of the average torque that was exerted, in N ⋅ m, if this takes 15 s? 

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