Physics Help Forum Application of Bernoulli's Equation (kinda simple)

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 Jan 5th 2010, 05:28 AM #1 Junior Member   Join Date: Nov 2009 Location: California Posts: 2 Application of Bernoulli's Equation (kinda simple) ok so I got this in class and was trying to figure it out but part b didn't make sense to me and i will show why not when I get there. 65. (A) Find the pressure difference on an airplane wing if air flows over the upper surface with a speed of 115 m/s and along the bottom surface with a speed of 105 m/s. (B) If the area of the wing is 32 m^2, what is the net upward force exerted on the wing? OK so I used Bernoulli's equation (duh) to calculate the first part going from P1 + .5pv1^2 = P2 + .5pv2^2 w V1=115 & v2=105 then i plugged everything in trying to find change in Pressure using 1.29 kg/m^3 as density and got change in P=1419 alright, now on b i know the formula P=F/A and I know I have A but I do not understand where to get this new P for the F exerted up. My lab partners told be to just use the difference in P but that totally does not make sense and I am wondering why that would work. PLEASE HELP!!! and thank you ahead of time! Last edited by I<3Kinematics; Jan 5th 2010 at 05:29 AM. Reason: spelling error
 Jan 5th 2010, 07:41 AM #2 Senior Member   Join Date: Oct 2009 Location: india Posts: 409 if i split the problem into 2 parts, perhaps it may make sense. say i have P1 air pressure above the wing and P2 air pressure below the wings. so force exerted by P1 on wing= P1 A downward. force exerted by P2 on wing= P2 A upwards. so net force upward=P2 A- P1 A=(P2-P1)A =pressure difference*area hope that helps.

 Tags application, bernoulli, bernoulli's, equation, kinda, pressure, simple

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# Find the pressure difference on an airplane wing if air flows over the upper surface with a speed of 115m/s, along the bottom surface with a speed 105m/s

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