Required information An air-standard cycle is executed within a closed piston-cylinder system, and it consists of the following three processes: 1-2 V= Constant heat addition from 100kPa and 36C to 850kPa 2-3 Isothermal expansion until V3=8.5V2 3-1 P= Constant heat rejection to the initial state Assume air has constant properties with cV=0.718kJ/kgK,cp=1.005kJ/kgK,R=0.287kJ/kgK, and k=1.4. Determine the ratio of the compression work to the expansion work (the back work ratio). The back work ratio is