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Unformatted text preview: for laminar flow only!! • The flow of air is highly turbulent here! The Bernoulli principle acting on an umbrella Same principle used in sailing can go faster than wind! Wind damage to buildings v inside ~0, v outside >>0 p = p in p out >>0 building "explodes“! E.g.: v outside = 360 km/h (~220 mi/h) p = (1/2) air v out 2 ~ 6000 Pa (~ 0.06 p atm ) Upward force on 80 m 2 house roof: p A ~ 5 10 5 N ~ 50 tons! Hancock Building (Boston, 1973): Ventilation of prairie dog burrows v 1 v 2 v 1 > v 2 p 1 < p 2 What is the pressure at the top of the siphon? h p A. p B. p + gh C. p – gh D. less than p – gh E. greater than p + gh d...
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 '07
 LIEPE, M
 Physics, Fluid Dynamics, Bernoulli, Aerodynamics, measuring air speed

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