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The gas in an air cannon expands , from V₁= 2.0-m³to 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 P₁to P₂, and the second an isobaric expansion from V₁to V₂.

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