7. (6 points) A monatomic ideal gas is taken through the following three process cycle in a sealed container. The heat entering and leaving the system is also illustrated. P (Pa) 4.0 3.0- 2.0- 1.0- 3 J 1.0 2.0 7.5 J 7.5 J -V (m) 3.0 4.0 (a) What is the efficiency or what are the coefficients of performance for this cycle? heat engine =) efficiency => |Q H Qc Q = 7.5J +33 = 10.5J {W = area of triangle = (3 m) (2 P) = 3J => eff = = 10.5J 28.6% QH is t Quis (b) If the cold reservoir is at 300 K, and the process is running at its maximum possible efficiency/CoP, what is the temperature of the hot reservoir? Max eff = T = 0.286 TT TH TH = 0.714 T = 420K TH