A jet airplane in level flight has a mass of 8.62x10^4kg, and the two wings have

Question

A jet airplane in level flight has a mass of 8.62x10^4kg, and the two wings have an estimated total area of 89.0m^2. (a) What is the pressure difference between the lower and upper surfaces of the wings? Incorrect: Your answer is incorrect. Pa (b) If the speed of air under the wings is232m/s, what is the speed of the air over the wings? Assume air has a density of 1.29 kg/m^3. Incorrect: Your answer is incorrect. m/s (c) Explain why all aircraft have a ceiling, a maximum operational altitude. The density of air decrease with increasing height, resulting in a smaller pressure difference. Beyond the maximum operational altitude, the pressure difference can no longer support the aircraft.

Explanation / Answer

a) pressure difference = 8.62*10^4*9.8/89 = 9491.7 Pa b) .5*1.29*( v^2 - 232^2) = 9491.7 so, v = 261.8 m/s

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