Question 1 A cylinder with a movable piston contains 6 kg of air with initial temperature of 25 "C. The atmospheric pressure is 1 atm. This cylinder is then allowed to heat up and the temperature of the air is raised to 500 "C. The piston is free to move during the heating process. (a) What type of process below is used to describe the above process? (1) Isothermal process (ii) Isobaric process (iii) Isochoric process (b) What is the initial volume (before heating) and final volume of the air (after heating)? (c) Calculate the heat energy required to increase the air temperature from 25 "C to 500 "C. Given that the C. is 0.718 kJ/kg-k and the specific heat ratio y = 1.4 . (d) Calculate the work done by the system. (e) Assume no heat loss to the surrounding, what is the change of specific internal energy of the air? (f) Alternative to (e) above. In reality, the actual change in internal energy of air is 1,200 kJ only. This give evidence to prove the concept of which law of thermodynamic is correct