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Q.

When an aircraft is flying, let V1 be the speed of air just below the wings and V2 be the speed of air just above the wing. Then

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a

V1 > V2

b

V1 = V2

c

V1 < V2

d

if the density of air is very low, then V2 > V1

answer is A.

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Detailed Solution

Applying Bernoulli's equation between points 1 and 2, we can write, p1+12ρv12=p2+12ρv22⇒ p1−p2=12ρv22−v12If A be the area of each wing, then total lift on the wings, L=2A×p1−p2=Aρv22−v12Air craft can fly only when L>0 i.e. V2>V1
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