Question

What is the net upward force on an airplane wing of area 21.0 m2 if the...

What is the net upward force on an airplane wing of area 21.0 m2 if the speed of air flow is 200 m/s across the top of the wing and 175 m/s across the bottom? (The density of air where the airplane flies is ?air = 1.21 kg/m3.

Homework Answers

Answer #1

here,

From Bernoulli's theorem we have

Pa + 0.5 p va^2 = Pb + 0.5 p vb^2

Where Pa and Pb represent pressure

p represents density

va and vb represent velocity

Data:

Net force = ?

Area = A = 10.2 m.s^-2

Velocity across the top...= va = 200 ms^-1

Velocity across the bottom. ..=vb = 175 ms^-1

Density of air , p = 1.21 kgm^-3


Pa - Pb = 0.5 × 1.21× (200^2 - 175^2)

P = 5671.9 pascal

Since P= F/A

F = 270.1 newton

the net upward force on an airplane wing is 270.1 newton

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