Adisk-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 exertes by the axe on the grindstone?

τ=0.060 N.m

Explanation:

By kinematics:

Solving for α:

where ωo = 600*2*π/60;   ωf = 0;    t=10s

The sum of torque is:

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

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