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Q.

The lift force acting on the wing of an aeroplane is 2600N. If the area of the wing is 5m2 and velocity of air on the lower surface of the wing is 10m/s, velocity of air on the upper surface of the wing is (density of air is 1.3kg/m3)

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a

20m/s

b

25m/s

c

35m/s

d

30m/s

answer is D.

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Detailed Solution

F=(P1−P2)A=12ρ(V22−V12)A 2600=12×1.3[V22−100]×5⇒V2=30ms−1

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The lift force acting on the wing of an aeroplane is 2600N. If the area of the wing is 5m2 and velocity of air on the lower surface of the wing is 10m/s, velocity of air on the upper surface of the wing is (density of air is 1.3kg/m3)