There are two holes, each of cross-sectional area a, on the oppisite side of a wide rectangular tank containing a liquid of density `rho`. When the liquid flows out of the holes the net force on the tank is [`h` is the vertical distance between the two holes].

Options

A. `2alpha rho gh`
B. `4alpha rho gh`
C. `0.5alpha rho gh`
D. `alpha rho gh`

Answer

A

Explanation

`F = alpha v^(2) rho`
Net force
`=alpha rho(v_(2)^(2)-v_(1)^(2)) = alpha rho[2g(h+y)-2gy]`
`=2 alpha rho gh`.