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A boy is riding his bike with his wheels spinning at 3380 rpm. The boy sits...

A boy is riding his bike with his wheels spinning at 3380 rpm. The boy sits on his bike to the ground where his weight causes the heels friction to bring the wheels at a rest for 4.0 seconds. The wheel has a radius of 18cm and weighs 40kg. What is the coefficient of friction between the bike wheel and the ground?

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