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A cargo plane has two wings and each wing has an area of 34.15 m2. The...

A cargo plane has two wings and each wing has an area of 34.15 m2. The mass of the cargo plane is 9310 kg. When the plane is taking off, the speed of the air over the top of the wing v2 is 1.8 times air speed under the wing v1 (i.e. v2 = 1.8 v1). If v1 is the same as the speed of the plane, what is the minimum speed of the plane v1 to obtain enough lift force for the plane’s takeoff? (The density of the air is 1.29 kg/m3)

A. 72.9 m/s

B. 36.4 m/s

C. 1340 m/s

D. 30.4 m/s

E. 51.5 m/s

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Answer #1

Find the required speed using Bernoulli’s principle as shown below and the relation between pressure difference and force and area.

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