Homework Help: physics

Posted by Jen on Tuesday, November 13, 2007 at 7:57pm.

Modern airplane design calls for a lift, due to the net force of the moving air on the wing, of about 2000 N per square meter of wing area. Assume the air flows past the wing of an aircraft with streamline flow. If the speed of flow past the lower wing surface is 120m/s, what is the required speed over the upper surface to give a lift of 2000 N/m^2? The density of air is 1.20 kg/m^3

physics - drwls, Tuesday, November 13, 2007 at 8:26pm
The net lift per wing area, using the Bernoulli equation, is
(1/2)(air density)[(Vtop)^2-(Vbottom)^2]
= 2000 N/m^2

In your case Vbottom = 120 m/s
Solve for Vtop.
physics - Jen, Tuesday, November 13, 2007 at 8:41pm
ok I got 133.2 m/s..is that right?
physics - bobpursley, Tuesday, November 13, 2007 at 9:05pm
Yes.

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