Homework Help: physics

Posted by Jaime on Thursday, January 29, 2009 at 11:47pm.

Air streams horizontally past a small airplane's wings such that the speed is 70.0m/s over the top surface and 60.0m/s past the bottom surface. If the plane has a wing area of 16.2m^2 on the top and on the bottom, what is the net vertical force that the air exerts on the airplane?

physics - bobpursley, Thursday, January 29, 2009 at 11:57pm
http://hyperphysics.phy-astr.gsu.edu/Hbase/pber.html

As a first approximation assume the density of the air is the same on the bottom side as the top.

Pbottom+d*1/2 *Vbottom^2=Pressuretop + d*1/2*Vtop^2
or pressuretop-pressurebottom=d*1/2(Vtop^2-Vbottom^2)

So, after you calculate that pressure difference, multipy it by the wing area, and you have the lift force.

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