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Air flows through a heating duct with a square cross-section with 7-inch

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Question

Air flows through a heating duct with a square cross-section with 7-inch sides at a speed of 4.9 ft/s. Just before reaching an outlet in the floor of a room, the duct widens to assume a square cross-section with sides equal to 16 inches. Compute the speed of the air flowing into the room (in ft/s), assuming that we can treat the air as an incompressible fluid.

 
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