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Air is streaming past a horizontal airplane wing such that its speed is 90m/s at the lower surface and 120m/s over the upper surface. If the wing is 10 m long and has an average width of 2 m, the difference of pressure on the two sides and the gross lift on the wing respectively, are (density of air = 1.3kgm-1)

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5 Pa, 900 N

95 Pa, 900 N

4095 Pa, 900 N

4095 Pa, 81900 N

answer is D.

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Detailed Solution

$P_{2} - P_{1} = \frac{1}{2} \times 1.3 [120^{2} - 90^{2}] = 4095 P a$
Lift $= 4095 \times 2 \times 10 N = 81900 N$

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