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Air is streaming pasta horizontal airplane wing such that its speed is `90 m` at the lower surface and `120 ms^(-1)` over the upper surface. lithe wing is `10 m` long and has an average width of `2 m`, the difference of pressure on the two sides and the gross lift on the wing respectively, are (density of air `=1.3kgm^(-3)`)

A

`5Pa, 900N`

B

`95Pa,900N`

C

`4095Pa,900N`

D

`4095Pa,81900N`

Text Solution

Verified by Experts

The correct Answer is:
D
`P_(2)-P_(1)=1/2xx1.3[120^(2)-90^(2)]=4095Pa`
Lift `= 4.95xx2xx10N=81900N`
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