A jet airplane in level flight has a mass of 8.66 x 10 4 kg, and the two wings h

Question

A jet airplane in level flight has a mass of 8.66 x 104 kg, and the two wings havean estimated total area of 91.0m2. (a) What is the pressure difference between thelower and upper surfaces of the wings?
1 Pa

(b) If the speed of air under the wings is 235 m/s, what is the speed of the air over thewings? Assume air has a density of 1.29 kg/m3.
2 m/s

(c) Explain why all aircraft have a "ceiling," a maximumoperational altitude.
The density of air 3---Select---increasesdecreases with 4---Select---increasingdecreasing height, resulting in a 5---Select---smallergreater pressure difference. Beyond the maximum operationalaltitude, the pressure difference can no longer support theaircraft.

Note: the first part of C is either INCREASING ORDECREASING
          the secondpart is   is also either INCREASING OR DECREASING
          the lastpart iseither                 SMALLER OR GREATER
(a) What is the pressure difference between thelower and upper surfaces of the wings?
1 Pa

(b) If the speed of air under the wings is 235 m/s, what is the speed of the air over thewings? Assume air has a density of 1.29 kg/m3.
2 m/s

(c) Explain why all aircraft have a "ceiling," a maximumoperational altitude.
The density of air 3---Select---increasesdecreases with 4---Select---increasingdecreasing height, resulting in a 5---Select---smallergreater pressure difference. Beyond the maximum operationalaltitude, the pressure difference can no longer support theaircraft.

Note: the first part of C is either INCREASING ORDECREASING
          the secondpart is   is also either INCREASING OR DECREASING
          the lastpart iseither                 SMALLER OR GREATER

Explanation / Answer

the total force on the wings of the air plane                  F = Mg M = mass of air plane the area of wing spaan = A pressure of air under the wings         P' = F / A if V and V' be the velocity of air above and below thesurface of the plane            V^2 / 2 + P = V'^2 / 2 +P'        assuming that P =atomspheric pressure , and given V' = 235m/sec        from the knownvalues using abv relation we can solve for velocity aof air abv theplane V . the density of air with height decreases , so to creat apressure difference that support the weight of the plane is limited to certain height, abv which the velocity of the plane is insifficient to creat enough pressure difference.           

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