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(a) When rebuilding her car's engine, a physics major must exert 450 N of force to insert a dry steel piston into a steel cylinder at a constant velocity. (Assume the coefficient of kinetic friction is 0.3.) What is the normal force between the piston and cylinder?

(b) What force would she have to exert if the steel parts are oiled, so that the coefficient of friction is 0.03?

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Category:- Physics
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