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Q.

An aeroplane is flying horizontally, so that velocity of wind above the wings is 50 ms-1 and that below the wings is 40 ms-1. If area of wings is 50 m2 and density of air is 1.2 kgm-3 then the dynamic lift on the aeroplane is

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a

3 kN 

b

27 kN

c

13.5 kN

d

54 kN

answer is B.

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Detailed Solution

F=12ρV2−V12A

=12×1.2502−40250N=27kN

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