A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min.After the power is shut off,a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later.What is the average torque exerted by the axe on the grindstone?
A)9.6 mN · m
B)0.12 N · m
C)0.75 N · m
D)0.60 kN · m
E)0.060 N · m

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The Answer of A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min.After the power is shut off,a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later.What is the average torque exerted by the axe on the grindstone?
A)9.6 mN · m
B)0.12 N · m
C)0.75 N · m
D)0.60 kN · m
E)0.060 N · m

A Disc-Shaped Grindstone of Mass 3