A hand-driven tire pump has a 250 cm diameter piston and a, Ask an Expert

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A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 32.0 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)? (You may consider this an isothermal process.)

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

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