#### Sample Thermodynamics Problems Solution

**Question 2. **A gas in a piston-cylinder assembly undergoes a compression process for which the relationship between pressure and volume is given by 𝑝𝑉1.3=𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡. The initial pressure is 67 lbf/in^{2}, initial volume is 7.4 ft^{3} and the final pressure is 140 lbf/in^{2}.

- a) State the engineering model
- b) Draw p-v diagram
- c) Calculate the final volume, in ft
^{3} - d) Determine the work done during the process, in Btu.