Homework Help: physics

Posted by alistair on Sunday, March 20, 2011 at 6:31am.

An airplane has an effective wing surface area of 16 square meter that is generating the lifting force. In level flight the air speed over the top of the wings is 62m/s, while the air speed beneath the wings is 54m/s. What is the weight of the plane?

physics - drwls, Sunday, March 20, 2011 at 7:40am
Weight = Lift
= Area*(PressureBottom - PressureTop)
= (1/2)(air density)*Area*(V2^1 - V1^2)

V2 = 62 m/s
V1 = 54 m/s

The air density depends temperature and altitude. It should be about 1.2 kg/m^3. You decide what to assume.

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