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 7PQ: A 12.0-kg solid sphere of radius 1.50 m is being rotated by applying a constant tangential force of...
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Question
![A 57.5-kg grindstone is a solid disk 0.6 m in diameter. You press an ax down
on the rim with a normal force of 164.9 N.
m
The coefficient of kinetic friction between the blade and the stone is 0.7, and
there is a constant friction torque of 9.5 N m between the axle of the stone
and its bearings. Another force is applied tangentially at the end of a crank
handle 0.5 m long to bring the stone from rest to 164.1 rev/min in 8.1 s.
After the grindstone attains an angular speed of 120 rev/min, what tangential
force at the end of the handle is needed to maintain a constant angular speed
of 120 rev>min?
*1 = 1/2 MR2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0297be60-0bc9-441d-aea1-0aafd3fd166a%2F55183f74-09af-4a4b-8748-28162234c6a1%2Fcf2ljjn_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 57.5-kg grindstone is a solid disk 0.6 m in diameter. You press an ax down
on the rim with a normal force of 164.9 N.
m
The coefficient of kinetic friction between the blade and the stone is 0.7, and
there is a constant friction torque of 9.5 N m between the axle of the stone
and its bearings. Another force is applied tangentially at the end of a crank
handle 0.5 m long to bring the stone from rest to 164.1 rev/min in 8.1 s.
After the grindstone attains an angular speed of 120 rev/min, what tangential
force at the end of the handle is needed to maintain a constant angular speed
of 120 rev>min?
*1 = 1/2 MR2
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