Question

# A small jet airplane has a total wing area of 67.5 m2 and a mass of...

A small jet airplane has a total wing area of 67.5 m2 and a mass of 8.03 104 kg.

(a) If this jet is in horizontal flight, determine the pressure difference between the lower and upper surfaces of the wings. in Pa ?

(b) When the speed of air traveling over the wing is 247 m/s, determine the speed of air under the wing. Use 1.29 kg/m3 as the density of air. in m/s ?

(c) Which answer is correct to the question "Why do all aircraft have a maximum operational altitude?"

1.) The density of air decreases with higher altitude, which decreases the pressure difference until it cannot support the aircraft.

2.) The density of air increases with higher altitude, which increases the pressure difference until it cannot support the aircraft.

3.) The density of air increases with higher altitude, which decreases the pressure difference until it cannot support the aircraft.

4.) The density of air decreases with higher altitude, which increases the pressure difference until it cannot support the aircraft.

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