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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

4.0950 Pascal

b

40.950 Pascal

c

4095.0 Pascal

d

409.50 Pascal

answer is A.

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Detailed Solution

From the Bernoulli's theorem

$P_{1} - P_{2} = \frac{1}{2} ρ (v_{2}^{2} - v_{1}^{2}) = \frac{1}{2} \times 1.3 \times [{(120)}^{2} - {(90)}^{2}]$

$= 4095 N / m^{2}$ or Pascal

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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