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Q.

The flow speeds of air on the lower and upper surfaces of the wing of an aeroplane are v and 5v respectively. The density of air is r and surface area of wing is A. The dynamic lift on the wing is :

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a

2ρv2A

b

ρv2A

c

1/2ρv2A

d

2ρv2A

answer is D.

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Detailed Solution

F=∆PA=12ρv22-v12A F=12ρ5v2-v2A=2ρv2A

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