Q.

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 10 m long and has an average width of 2 m, then the difference of the pressure on the two sides of the wing of

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a

4095.0 Pascal

b

409.50 Pascal

c

40.950 Pascal

d

4.0950 Pascal

answer is A.

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Detailed Solution

From the Bernoulli's theoremP1−P2=12ρ(v22−v12)=12×1.3×[(120)2−(90)2]=4095 N/m2 or Pascal
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