Q.

Air streams horizontally across an aeroplane wing of area 3 m2 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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a

3000 N

b

3500 N

c

4000 N

d

3054 N

answer is D.

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Detailed Solution

Lift on the wing =p2A(v12−v22)   =1.2932×3[(60)2−(45)2] =0.6465×3×105×15 =3054 N
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Air streams horizontally across an aeroplane wing of area 3 m2 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 )