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Q.

The pressure on the top surface of an aeroplane wing was 0.90×105Pa  and at the bottom surface is 0.91×105Pa . If the area of each surface is 40m2,  the net lift force on the wing is

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a

2×104N

b

72×105N

c

6×107N

d

4×104N

answer is D.

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Detailed Solution

F=ρA2(v22−v12)  =(p1−p2)A =40(0.91×105−0.9×105)     =4×104N
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The pressure on the top surface of an aeroplane wing was 0.90×105Pa  and at the bottom surface is 0.91×105Pa . If the area of each surface is 40m2,  the net lift force on the wing is