49. We use the Bernoulli equation: p ` + 1 2 ρv 2 ` = p u + 1 2 ρv 2 u ,where p ` is the pressure at the lower surface, p u is the pressure at the upper surface, v ` is the air speed at the lower surface, v u is the air speed at the upper surface, and ρ is the density of air. The two tubes of ﬂow are essentially at the same altitude. We
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