4.9 & 4.11

4.10. An ideal gas is flowing steadily in a horizontal, adiabatic nozzle. The inlet conditions are T1=600F and V1=300ft/s. The outlet velocity is 1500ft/s. The heat capacity CP is 0.24Btu/lbm.F. What is the temperature of the gas leaving the nozzle? 4.11. * The rigid vessel shown in Fig. 4.5 has a volume of 1ft3 and contains an ideal gas at 100F. The input to the heater is regulated to hold the temperature constant at 100F. Originally it is at a pressure of 100lbf/in2. The valve is partly opened, and the gas is allowed to escape slowly. When the pressure in the FIGURE 4.5 vessel has fallen to 20lbf/in2, the valve is closed. How much Rigid vessel with internal heat was added by the heater during this period? temperature held constant 4.12. A rigid container is initially evacuated. Its valve is then by an electric heater. opened and air flows in until the pressure is 1atm. Assume