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Bernoulli Principle Problem 
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#1
Apr1208, 09:54 PM

P: 92

1. The problem statement, all variables and given/known data
Find the lift in newtons due to the Bernoulli Principle on a wing of a plane of area 84.5 m^2 if the air passes over the top and the bottom surfaces at speeds of 347m/s and 289 m/s 2. Relevant equations P1+(1/2)densityV^2 =P2+(1/2)densityV^2 3. The attempt at a solution Ok so i know the density of air is 1.29kg/m^3 so i plug into equation to get 1/2(1.29kg/m^3)(347m/s)^2= 1/2(1.29kg/m^3)(289m/s)^2 then i get answer of 5.39x10^4 N/m^2 then i use equation F=PA and P is 5.39x10^4 N/m^2 and A is 84.5m^2 to get answer of 4.6x10^6 N Am i correct ? 


#2
Apr1308, 12:51 AM

P: 83

By bernouili equation
Pa+1/2pva^2 = Pb =1/2pvb^2 1/2pvb^21/2pva^2 =PaPb deltaP = 1/2pvb^21/2pva^2 deltaP * A =Lift force I think your method is correct 


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