   Chapter 9, Problem 39P

Chapter
Section
Textbook Problem

A jet airplane in level flight has a mass of 8.66 × 104 kg, and the two wings have an estimated total area of at is the pressure difference between the surfaces of the wings? (b) If the speed of air under the wings is 225 m/s, what is the speed of the air over the wings? Assume air has a density of 1.29 kg/m3. (c) Explain why all aircraft have a “ceiling,” a maximum operational altitude.

(a)

To determine
The pressure difference between the lower and upper surfaces of the wings.

Explanation

Given info: The mass of the jet airplane is 8.66×104kg , total area of the wing is 90.0m2 , and acceleration due to gravity is 9.80m/s2 .

The formula for the pressure difference between lower and upper surfaces of the wings is,

PlowersurfacePuppersurface=mgA

• m is mass of the jet airplane.
• g is acceleration due to gravity.
• A is total area of the wings.

Substitute 8.66×104kg for m , 90.0m2 for A , and 9.80m/s2 for g to find PlowersurfacePuppersurface

(b)

To determine
The speed of the air over the wings.

(c)

To determine
All aircraft have a ceiling a maximum operational altitude.

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