Air stream flows horizontally past an aeroplane wing of surface area `4 m^(2)`. The speed of air over the top surface is `60 ms^(-1)` and under the bottom surface is `40 ms^(-1)` The force of lift on the wing is (density of air =`1 kgm^(-3)`)

Options

A. 800 N
B. 1000 N
C. 4000 N
D. 3200 N

Answer

C

Explanation

Level in the container will become maximum when rate of inflow = rate of outflow.
`Q=A_(1)v=A_(1)sqrt(2gh_("max"))`
`therefore" "h_("max")=Q^(2)/(2gA_(1)^(2))`