Question: A hand-driven tire pump has a piston with a 2.50-cm diameter and a maximum stroke of 30.0 cm. (a) How much work do you do

A hand-driven tire pump has a piston with a 2.50-cm diameter and a maximum stroke of 30.0 cm. 

(a) How much work do you do in one stroke if the average gauge pressure is 2.40 x 105 N/m2 (about 35 psi)?

(b) What average force do you exert on the piston, neglecting friction and gravitational force?

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