58. •• The working substance of a cyclic heat engine is 0.75 kg of an ideal gas. The cycle consists of two isobaric processes and two isometric processes, as shown in ▼ Figure 12.27. What would be the efficiency of a Carnot engine operating with the same high-temperature and low-temperature reservoirs?

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Pressure (kPa) 150 2 250 0 1.75 Volume (x 10-2 m) 3 V 2.25