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Air flows in a square duct of constant cross section. Measurements at two points which are 30 m apart indicate uniform velocities of 30 m/s

Air flows in a square duct of constant cross section. Measurements at two points which are 30 m apart indicate uniform velocities of 30 m/s at point 1 and 130 m/s at point 2. Is the flow compressible? If so and the air at point 1 is at 1 kg/m3, evaluate the average density gradient in the duct.

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