c)Find the minimum coefficient of friction μμmu needed to prevent the spherical shell from slipping as it rolls down the slope.

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 79PQ
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A hollow spherical shell with mass 1.75 kgkg rolls without slipping down a slope that makes an angle of 40.0 degrees with the horizontal.

a.)

Find the magnitude of the acceleration acmacma_cm of the center of mass of the spherical shell.
Take the free-fall acceleration to be ggg = 9.80 m/s2m/s2 .
=3.78
b)
Find the magnitude of the frictional force acting on the spherical shell.
Take the free-fall acceleration to be ggg = 9.80 m/s2m/s2 .
=4.41
c)Find the minimum coefficient of friction μμmu needed to prevent the spherical shell from slipping as it rolls down the slope.
 
i need help with C) ive got the first two.
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