A heat engine using 120 mg of helium as the working

Chapter 21, Problem 21.90

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A heat engine using 120 mg of helium as the working substance follows the cycle shown in FIGURE P21.61. a. Determine the pressure, temperature, and volume of the gas at points 1, 2, and 3. b. What is the engines thermal efficiency? c. What is the maximum possible efficiency of a heat engine that operates between Tmax and Tmin?

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