A disc‐shaped grindstone with a mass of 50 kg and a diameter of 0.52m rotates on frictionless bearings at 850 rev/min. An ax is pushed against the rim (to sharpen it) with a normal force of 160 N. The grindstone subsequently comes to rest in 7.5 seconds. What is the co‐efficient of friction between ax and stone?
A disc‐shaped grindstone with a mass of 50 kg and a diameter of 0.52m rotates on frictionless bearings at 850 rev/min. An ax is pushed against the rim (to sharpen it) with a normal force of 160 N. The grindstone subsequently comes to rest in 7.5 seconds. What is the co‐efficient of friction between ax and stone?
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 30PQ
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1
A disc‐shaped grindstone with a mass of 50 kg and a diameter of 0.52m rotates on frictionless bearings at
850 rev/min. An ax is pushed against the rim (to sharpen it) with a normal force of 160 N. The
grindstone subsequently comes to rest in 7.5 seconds.
What is the co‐efficient of friction between ax and stone?
2. A wheel experiences a constant acceleration of +1.5 rad/s^2.
a) How long would it take the wheel to attain an
from rest?
b) Through what angle would it turn in that time
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