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An airplane is flying at an altitude of 10 km at 120 m/s. Its jet engines,...

An airplane is flying at an altitude of 10 km at 120 m/s. Its jet engines, which for now can be approximated as a converging duct, have an inlet diameter of 1.5m and an exit diameter of 0.3m. The exit of the engine has a temperature altitude of 11 km, and pressure altitude of 10.5 km.

a. Is the flow incompressible or compressible? How do you know?

b. What is the velocity at the engine exit?

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