A plane is in level fight at constant speed and each of its two wings has an area of 
If the speed of the air on the upper and lower surfaces of the wing are 
and 
respectively, then the mass of the plane is (Take the density of the air = 1 kg 
)
Text Solution
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Let 
are the speed of air on the lower and upper surface S of the wings of the plane 
and 
are
the pressure there
According to Bernoulli’s theorem
Here, 
Area of wings 
Upward force on the plane
As the plane is in level flight therefore upward force balances the weight of the plane.
Mass of the plane, 
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