Air streams horizontally across an aeroplane wing of area 4m2 weighing 500kg . The air speed is 70 m/s and 50 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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4000 N

3500 N

5270 N

6206 N

answer is D.

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Detailed Solution

F=(p1−p2)A=12ρ(V22−V12)A=121.293(4900−2500)×4=6206N

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