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Questions  

The pressure on the top surface of an aeroplane wing was 8×105pa  and at the bottom surface is 10×105pa . If the area of each surface is 60m2, the net lift force on the wing is

a
120×105N
b
60×105N
c
40×105N
d
240×105N

detailed solution

Correct option is A

F=ρA2(v22−v12) =(p1−p2)A=(10×105−8×105)×60=2×105×60=120×105N

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