Problem 3: An air compressor fills a 10 ft³ tank. The tank initial temperature is 70°F, pressure
latm. The ambient air temperature is also 70°F, and pressure latm. During filling, the tank air
pressure and specific volume follows $pv^{1.4} = constant$.
Questions:
• What is the mass of air $m_1$ in the tank initially?
• If the final mass in the tank is $m_2 = 2.5 m_1$, what is the total internal energy of air in the
tank?
• How much work is done by the compressor?