The speeds of air-flow on the upper and lower surfaces of a wing of an aeroplane are 
and 
, respectively. If A is the cross-sectional area of the wing and 
is the density of air, then the upward lift is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Upward lift 
pressure difference 
area of wing 
From Bernoulli's theorem,
Pressure difference is
upward lift 
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