Air streams horizontally across an aero plane wing area 5m2 weighing 300 kg. The air speed is 30 m/s and 20 m/s over the top surface and the bottom surface respectively what is the lift on the wing? (density of air 2grm/ litre)

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1500 N

1000 N

2500 N

3500 N

answer is C.

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Detailed Solution

Lift on the wing =ρ2A(v12−v22)=22×5((30)2−(20)2) =5×500=2500N

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