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Q. A potter's wheel having a radius 0.53 m and a moment of inertia 14.8 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 65 N. Find the effective coefficient of kinetic friction between the wheel and the wet rag.

Q. A negative charge of -2.0 multiplied by 10-4 C and a positive charge of 9.5 multiplied by 10-4 C are separated by 0.30 m. What is the force between the two charges?

A negative charge of -6.0 multiplied by 10-6 C exerts an attractive force of 66 N on a second charge 0.054 m away. What is the magnitude of the second charge?

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