A 45-cm piston-cylinder system contains 0.55 m^3 of air. At the position shown, there is no force in the spring (k = 2.0 kN/m), and the pressure and temperature are 900 kPa and 350ĆĀ°C, respectively. Heat is transferred to the air until its volume increases by 50%. Determine:
a) The final temperature and pressure of the air in ĆĀ°C.
b) The change in total internal energy of the air in kJ.