Solved: What diameter must a 21.0-m-long air duct have if
Chapter 4, Problem 54P(choose chapter or problem)
(II) What diameter must a \(21.0-\mathrm{m}\)-long air duct have if the ventilation and heating system is to replenish the air in a room \(9.0 \mathrm{~m} \times 12.0 \mathrm{~m} \times 4.0 \mathrm{~m}\) every \(10 \mathrm{~min}\) ? Assume the pump can exert a gauge pressure of \(0.71 \times 10^{-3} \mathrm{~atm}\).
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