A disk-shaped grindstone of mass 1.7 kg and radius 8 cm is spinning at 730 rev/min. After
Question:
A disk-shaped grindstone of mass 1.7 kg and radius 8 cm is spinning at 730 rev/min. After the power is shut off, a woman continues to sharpen her ax by holding it against the grindstone for 9 s until the grindstone stops rotating.
(a) What is the angular acceleration of the grindstone?
(b) What is the torque exerted by the ax on the grindstone? (Assume constant angular acceleration and a lack of other frictional torques.)
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a t 730 2 60 9 rads ...View the full answer
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