A power cycle operates between two reservoirs having temperature 700 K and 300K, respectively. QH is the heat (thermal energy) received from the hot reservoir. QL is the heat rejected to the cool reservoir. Wmech represents the mechanical work produced. Please determine if the following cycles are possible and explain why?
A) QH=700 kJ, Wmech=400 kJ, QL=300 kJ;
B) QH=700 kJ, Wmech=500 kJ, QL=200 kJ;
C) QH=700 kJ, Wmech=300 kJ, QL=600 kJ;
D) QH=700 kJ, Wmech=600 kJ, QL=100 kJ;