Agas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is pv1.3 = constant. the mass of the gas is 0.4 lb and the following data are known: p1 = 160 lbf/in.2, v1 = 1 ft3, and p2 = 480 lbf/in.2 during the process, heat transfer from the gas is 2.1 btu. kinetic and potential energy effects are negligible. determine the change in specific internal energy of the gas, in btu/lb.
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Final pressure and temperature are 
Heat transfer from the gas is 2.1 Btu
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