PhysicsAir 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)

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)

  1. A

    3000 N

  2. B

    3500N

  3. C

    4000 N

  4. D

    3054 N

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    Solution:

    A=3m2,m=250kgρ=1.293g/=1.293×103103kg/m3V1=60m/s,V2=45m/sF=P2P1A=12ρV12V22×A=1.2932602452(3)=3054N

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