Determine the internal energy of water at 20 psia and 400 °F.
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- The air-release flap on a hot-air balloon is used to release hot air from the balloon when appropriate. On one hot-air balloon, the air release opening has an area of 0.5 m2, and the filling opening has an area of 1 m2. During a 2-min adiabatic flight maneuver, hot air enters the balloon at 100 kPa and 35°C with a velocity of 2 m/s; the air in the balloon remains at 100 kPa and 35°C; and air leaves the balloon through the air-release flap at velocity 1 m/s. At the start of this maneuver, the volume of the balloon is 75 m3. Determine the final volume of the balloon and work produced by the air inside the balloon as it expands the balloon skin.1 kg of gas is confined to a constant volume tank. Initial pressuree and volume are 4 atm and 0.21 m3, respectively. When a heat of 82 kJ is supplied to the system, the final temperature of the gas is 127C. What is the change in internal energy?