(a) when rebuilding her car's engine, a physics major must exert 300 n of force to insert a dry steel piston into a steel cylinder. what is the magnitude of the normal force between the piston and cylinder? (b) what is the magnitude of the force would she have to exert if the steel parts were oiled?

A) The magnitude of the normal force between the piston and cylinder is : 1000 N

B) The magnitude of the force exerted when parts are oiled = 10000 N

Given data :

Force exerted by physics major = 300 n

coefficient of friction of dry steel cylinder ( μ ) = 0.3  ( found online )

coefficient of friction with oil in between ( μ ) = 0.03  ( found online )

Force applied ( Fa ) = frictional force ( μ N )

therefore :

N = Fa / μ

where μ = 0.3

magnitude of normal force ( N ) = 300 / 0.3

                                                    = 1000 N

B) Determine the magnitude of force when oil is applied

N = Fa / μ

   = 300 / 0.03

   = 10000 N

Hence we can conclude that The magnitude of the normal force between the piston and cylinder is : 1000 N and The magnitude of the force exerted when parts are oiled = 10000 N

Learn more about magnitude of force : link

d is the answer i came up with