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Bernoulli Principle Problem

by th3plan
Tags: bernoulli, principle
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th3plan
#1
Apr12-08, 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 ?
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mysqlpress
#2
Apr13-08, 12:51 AM
P: 83
By bernouili equation
Pa+1/2pva^2 = Pb =1/2pvb^2
1/2pvb^2-1/2pva^2 =Pa-Pb
deltaP = 1/2pvb^2-1/2pva^2
deltaP * A =Lift force
I think your method is correct


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