5.81 a quantity of water within a piston–cylinder assembly executes a carnot power cycle. during isothermal expansion, the water is heated from saturated liquid at 50 bar until it is a saturated vapor. the vapor then expands adiabatically to a pressure of 5 bar while doing 364.31 kj/kg of work. (a) sketch the cycle on p–y coordinates. (b) evaluate the heat transfer per unit mass and work per unit mass for each process, in kj/kg. (c) evaluate the thermal efficiency.