Apotter's wheel having a radius 0.53 m and a moment of inertia 14kgÂ·m2 is rotating freely at 47 rev/min. The potter can stop thewheel in 6.5 s by pressing a wet rag against the rim and exerting aradially inward force of 71 N. Find the effective coefficient ofkinetic friction between the wheel and the wet rag.

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(a) A ball of mass 0.130 kg is dropped from rest from aheightof 1.25 m. It rebounds from the floor to reach a height of0.920 m.What impulse was given to the ball by the floor?
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(b) A potter's wheel -- a thick stone disk of radius 0.500mand mass 105 kg -- is freely rotating at 50.0 rev/min. Thepottercan stop the wheel in 6.00 s by pressing a wet rag againstthe rimand exerting a radially inward force of 65.0 N. Find theeffectivecoefficient of kinetic friction between the wheel andtherag. _____________ (igot .063, but that was the wrong answer)

Your grandmother enjoys creating pottery as a hobby. She uses a potter’s wheel, which is a stone disk of radius R = 0.500 m and mass M = 100 kg. In operation, the wheel rotates at 50.0 rev/min. While the wheel is spinning, your grandmother works clay at the center of the wheel with her hands into a pot-shaped object with circular symmetry. When the correct shape is reached, she wants to stop the wheel in as short a time interval as possible, so that the shape of the pot is not further distorted by the rotation. She pushes continuously with a wet rag as hard as she can radially inward on the edge of the wheel and the wheel stops in 6.0 s.

(a) You would like to build a brake to stop the wheel in a shorter time interval, but you must determine the coefficient of friction between the rag and the wheel in order to design a better system. You determine that the maximum pressing force your grandmother can sustain for 6.00 s is 70.0 N.

(b) What If? If your grandmother instead chooses to press down on the upper surface of the wheel a distance r = 0.300 m from the axis of rotation, what is the force needed to stop the wheel in 6.00 s? Assume that the coefficient of kinetic friction between the wet rag and the wheel remains the same as before.

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