Amonatomic ideal gas initially fills a v0 = 0.35 m3 container at p0 = 85 kpa. the gas undergoes an isobaric expansion to v1 = 0.75 m3. next it undergoes an isovolumetric cooling to its initial temperature t0. finally it undergoes an isothermal compression to its initial pressure and volume.

(a) identify the p-v diagram that correctly represents this three step cycle.
(b) calculate the work done by the gas, wi, in kilojoules, during the isobaric expansion

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This is the answer of your question

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j