The gas in an air cannon expands , from V1= 2.0-m3 to V2= 8.0-m3, while the pressure changes from P1= 6.0-atm to P1= 2.0-atm. If the heat supplied to the gas is 1.2 106-J and 1-atm = 1.013 105-N/m2, what is the change in the internal energy of the gas (in J, and watch out for signs)?
Calculate the change in energy if the above process occurs in two steps. The first step is an isovolumetric change from P1 to P2, and the second an isobaric expansion from V1 to V2.