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Air flow speed

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The heating and airflow ducts to and from the room are circular 0.30m in diameter, the room is 3mx4.5x6m and the air flow needs to be changed every 12 minutes. Calculate the Air flow speed.

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https://brainmass.com/physics/heat-thermodynamics/air-flow-speed-36444

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Note: In this problem we assume that the density of the air is constant

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The solution calculates Air flow speed.

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