Air streams horizontally across an aeroplane wing of area 3m2 weighing 250 kg. The air speed is 60 m/s and 45 m/s over the top surface and under the bottom surface respectively. What is the lift on the wing ? (Density of air 1.293 g/l)

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3000 N

3500N

4000N

3054N

answer is D.

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Detailed Solution

A = 3m2, m = 250kgρ=1.293gm/l=1.293×10-310-3kg/m3 V1 = 60m/s, V2 = 45m/s

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