Question
Air is streaming past a horizontal air plane wing such that its speed is 120m/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 is
Answer: Option A
:
A
From the Bernoulli's theorem
P1−P2=12ρ(v22−v21)=12×1.3×[(120)2−(90)2]
=4095N/m2 or Pascal
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:
A
From the Bernoulli's theorem
P1−P2=12ρ(v22−v21)=12×1.3×[(120)2−(90)2]
=4095N/m2 or Pascal
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