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(a) When rebuilding her car's engine, a physics major must exert 350 N of force to...

(a) When rebuilding her car's engine, a physics major must exert 350 N of force to insert a dry steel piston into a steel cylinder at a constant velocity. What is the magnitude of the normal force between the piston and cylinder? (Assume the coefficient of kinetic friction is 0.3.)
N

(b) What magnitude 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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