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Q.

A small aeroplane of mass 1040kg is flying horizontally. The total area of the wings in 10m2. Air has a velocity 50m / s below the wings. The velocity of the air above the wings such that the weight of the aeroplane could be balanced is ________ (density of air =1.3kg/m3g=10m/s2)

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a

30m / s

b

40m / s

c

35m / s

d

45m / s

answer is A.

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Detailed Solution

detailed_solution_thumbnail

P2P1A=mg

V22V122ρA=mg

502V1221.310=104010

V1=30m/s

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