on the rim with a normal force of 164.9 N.

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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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
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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