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Q1: A piston-cylinder assembly contains 1 kg of air. The gas expands from an initial state where T1=700K and P1=5 bar to a final state where
P2= 2 bar . During the process the pressure and specific volume are related by pV1.3 = constant .
Assuming ideal gas behavior and neglecting kinetic and potential energy effects , determine the heat transfer during the process in kJ using
1. A constant specific heat evaluated at 300 K
2. A constant specific heat evaluated at 700 K
3. Data Table A-17

َQ2: Air is compressed adiabatically from P1 = 100 KPa , T1 = 300 K to P2= 1500 KPa , V2 = 0.1227 m3/Kg . The air is then cooled at constant volume to T3 = 300 K . Assuming ideal gas behavior , and ignoring kinetic and potential energy effects , calculate the work for the first process and the heat transfer for the second process in KJ per Kg of air .
Solve the problem each of two ways :
1. Using data from Table A-17
2. Using a constant specific heat evaluated at 300 K