A closed piston-cylinder contains 5-kg of water. Initially, the temperature of the water is 225°C while the volume is 0.25 m3. The container is then isothermally expanded until the volume increases to 0.5 m3. a) Determine the final pressure, in MPa. Report your result to two decimal places using rounding. b) Determine the initial pressure, in kPa. Write your answer to one decimal place. c)Determine the change of internal energy of the system, in kJ. Report your answer to one decimal place using rounding.

Suppose that P1 = 900 lb and P2 = 1200 lb  Express your answer in kilopounds to three significant figures. Enter negative value in the case of compression and positive value in the case of tension.  a) FCD  b) FKJ

SHOW THE TABLE USED! A fixed amount of carbon dioxide goes through a polytropic process where n=1.4. The initial temperature of the CO2 is 250 K. The final temperature of the CO, is 400 K. If the mass of the CO2 is 12 kg and behaves as an ideal gas, determine the work, the change in internal energy, and the heat transfer during the process (in kJ). Note that PV=mRT. In this problem, can the carbon dioxide be considered an ideal gas at the initial conditions if the initial pressure is 150 kPa? Justify your answer quantitatively.

LAST DIGIT IS 5, So P2 = 1.45 Major: Mechanical Engineering   Course: Thermodynamics ( Homework for students )