A disk-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 disk-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 Disk-Shaped Grindstone of Mass 3