A 1.00-mol sample of a monoatomic ideal gas is taken through the cycle shown in the figure. At point A, the pressure, volume, and temperature are , , and , respectively. In terms of R and , find
(a) the total energy entering the system by heat per cycle
(b) the total energy leaving the system by heat per cycle
(c) the efficiency of an engine operating in this cycle
(d) Explain how the efficiency compares with that of an engine operating in a Carnot cycle between the same temperature extremes.