The boeing 747 has a cruising altitude of 45,000 feet and cruising speed of 275 m/s. at this elevation, the temperature and pressure according to the us standard atmosphere (air properties as a function of altitude) are 220k and 1.8x104 pa, respectively. the engines are steady state devices that can be modeled using the 1st law of thermodynamics with air (ideal gas) as the working fluid undergoing several processes.

1kg of water contained in a piston-cylinder assembly undergoes two processes in series from an initial state where the pressure is 3.0 bar and the temperature is 150°c process 1-2: the water is compressed isothermally to a volume of 0.25 m^3 with 120 kj of work being done to the system. process 2-3: the water is heated at constant volume to a final pressure of 10 bar. a. find the change in internal energy for the system. b. calculate the amount of heat transferred, in kj. c. sketch both processes on a t-v diagram. (196.33 kj/kg, 76.33 kj)