A triangular lamina of area `A` and height `h` is immersed in a liquid of density `rho` in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is.

Options

A. `1/2 A rho gh`
B. `1/3 A rho gh`
C. `1/6 A rho gh`
D. `2/3 A rho gh`

Answer

B

Explanation

Thrust of lamina = pressure at centroid `xx` Area
`=rho g h/3 xx A=(A rho g h)/(3)`