Air at 60°F and atmospheric pressure flows in a horizontal duct with a cross section corresponding to an equilateral triangle (all sides equal). The duct is 100 ft long, and the dimension of a side is 6 in. The duct is constructed of galvanized iron (k_s = 0.0005 ft ). The mean velocity in the duct is 12 ft /s. What is the pressure drop over the 100 ft length?

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100 ft 12 ft/s E 6 in.-