Q4. (20 marks) A monatomic gas is contained in a cylinder with a movable piston. Initially it has a volume Vo, pressure Po and temperature To. A weight is placed on the piston, and the gas is compressed adiabatically to a pressure 10Po. Hint: Express your answers in terms of Vo and To respectively. a) What is the final volume of the gas? b) What is the final temperature of the gas? c) What is the internal energy change of the gas? Explain why it changes.