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kinslow31
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Homework Statement
Hey guy's I am kind of struggling with this i would appreciate any help
A potter's wheel having a radius 0.49 m and a moment of inertia of 12.1 kg · m2 is rotating freely at 52 rev/min. The potter can stop the wheel in 6.0 s by pressing a wet rag against the rim and exerting a radially inward force of 74 N. Find the effective coefficient of kinetic friction between the wheel and the wet rag.
Homework Equations
kinematics
Wnc = ΔRotational Energy
The Attempt at a Solution
Ok here so i started this one trying to do an energy conservation 74Δx(or θ) + uknΔx = (1/2)iω^2
To represent the non conservative forces on one side and the change in rotational kinetic energy on the other, Δx being the stopping distance that can be obtained from kinematics
then i figured there might be a radial component instead of a torque
ƩFr = n + 74 = v^2/r*m
so the radial component gives u an n i can sub back in the conservation equation and it points in the same direction, is this anywhere near right or should i be representing the forces over a torque