An engineering student wants to satisfy her curiosity about the compressibility of air in motion. She has set up a converging nozzle in which air discharges into the atmosphere. Figure P11.39 shows the nozzle with the necessary information. For these conditions, find the velocity at the exit by using the incompressible Bernoulli's equation, a compressible isothermal process, and a compressible isentropic process. Comment on your results.

Figure P11.39

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Po = 175 kPa T = 300 K V = 0 Po = 2.04 kg/m T = 300 K Pb = 100 kPa V P = 1.16 kg/m