3.6 Exercise 21

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 $2.4 \times 10^{5} \left( \text{N}/\text{m}\right)^{2}$ (about 35 psi)? (b) What average force do you exert on the piston, neglecting friction and gravitational force?