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zodiacbrave
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Homework Statement
The wings have a total surface area of 250 m^2. The air above the wing is 300 m/s and the air below the wing is 250 m/s. The ambient air pressure is around 0.5 atm. The airplane is descending at 20 m/s, therefore there is an upward drag on the wings.
What is the mass of the airplane?
Homework Equations
Pt + (1/2)pVt^2 = Pb + (1/2)pVb^2
The Attempt at a Solution
Fw = m * 9.8 m/s^2. Pair = 5.05 x 10^4 Pa
Density of air at height of plane, pair = (po / Po)* Pair = 0.645 kg/m^3
Plugging into Pt + (1/2)pVt^2 = Pb + (1/2)pVb^2
Pb - Pt = 16.125 Pa
Fw = msg - Flift.
I'm not sure how to deal with the force pressing down caused by 20 m/s
Thank you