For this question, consider a cylinder filled with a gas, com- pressed by a piston, as discussed in lectures. Consider the gas to be an ideal gas with constant heat capacity at fixed pressure (Cp) and constant heat capacity at fixed pressure (Cy). (See Tutorial 2). Both Cp and Cy are positive numbers. (a) How could we place this system into a state that is in mechanical equilibrium, but not in thermal equilibrium, with its surroundings? (b) We wish to raise the temperature of the gas isobarically (at constant pressure), and then lower the temperature isochorically (at constant volume). Briefly describe an experimental process that will achieve this. (c) The gas expands isobarically and reversibly from (Vo, Po, To) to (V₁, Po, T₁) — call this Process 1. Illustrate this process on a pV -diagram.

For this question, consider a cylinder filled with a gas, com- pressed by a piston, as discussed in lectures. Consider the gas to be an ideal gas with constant heat capacity at fixed pressure (Cp) and constant heat capacity at fixed pressure (Cy). (See Tutorial 2). Both Cp and Cy are positive numbers. (a) How could we place this system into a state that is in mechanical equilibrium, but not in thermal equilibrium, with its surroundings? (b) We wish to raise the temperature of the gas isobarically (at constant pressure), and then lower the temperature isochorically (at constant volume). Briefly describe an experimental process that will achieve this. (c) The gas expands isobarically and reversibly from (Vo, Po, To) to (V₁, Po, T₁) — call this Process 1. Illustrate this process on a pV -diagram.