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Question

The velocity of the air just over the wing is (in m/s):
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  1. 250
  2. 125
  3. 500
  4. 200

A
125
B
500
C
250
D
200
Solution
Verified by Toppr

Compression of the streamlines means that the stream tube above the wing has a smaller cross-sectional area than that in front of the plane and from the continuity equation , the velocity v' of the air must therefore be greater above the wing.
Area A=810A
AA=108
From continuity equation:
Av=Av
v=AAv=108×200=250ms1

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