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Question

Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3 kg per metre3 and the wing is 1o m long and has an average width of 2m , then the difference of the pressure on the two sides of the wing of

A
4095.0 Pascal
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B
409.50 Pascal
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C
40.950 Pascal
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D
4.0950 Pascal
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Solution

The correct option is B 4095.0 Pascal
Using the Bernoulli's theorem in the upper and lower surface of the wings in the airplane
P1P2=12ρ(v22v21)

=12×1.3×[(120)2(90)2]

=4095N/m2 or Pascal

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