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5) Air flows through a smooth duct of diameter 20cm at an average velocity of 5m/s. It then flows into a smooth square duct of

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5) Air flows through a smooth duct of diameter 20cm at an average velocity of 5m/s. It then flows into a smooth square duct of side length a. Find the square duct size a for which the pressure drop per meter will be exactly the same as the circular duct (=1.20kg/m3 and = 1.8E5kg/ms )

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