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An engine evolves according to four different processes. At point A, the system is at pressure...

An engine evolves according to four different processes. At point A, the system is at pressure Pa and volume Va. It evolves to a point B isochorically such that its pressure increases. It then evolves isobarically to point C where its volume is larger, and then isochorically to point D such that its pressure is Pa. Finally, the system evolves back to point A isobarically. (a) Draw a P − V diagram. (b) What is the work done by this engine?

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