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Q.

The total area of wings of an aeroplane is 10 m2 .The speed of air above and below the wing is 140 m/s and 110 m/s. Then the force on the aeroplane by air is :

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a

48750 N

b

48000 N

c

95000 N

d

50000 N

answer is A.

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Detailed Solution

From P1-P2=12ρ(V22-V12)Force F=(P1-P2)A=12ρA(V22-V12) F=12×1.3×10(140)2-(110)2 F=48750 N
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