A heat engine using 1.0 mol of a monatomic gas follows the cycle shown in FIGURE P21.55. 3750 J of heat energy is transferred to the gas during process 1 †’ 2.
a. Determine W_s, Q, and ΔE_thfor each of the four processes in this cycle. Display your results in a table.
b. What is the thermal efficiency of this heat engine?

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p (kPa) 3 Pmax 3750 J 300 - T = 300 K 0- Vmin Vmax = 2V, min FIGURE P21.55 4)