Question

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

• A. $\frac { 1 } { 2 } A \rho g h$
• B. $\frac { 1 } { 3 } A \rho g h$
• C. $\frac { 1 } { 6 } A \rho g h$
• D. $\frac { 2 } { 3 } A \rho g h$

Answer 1

Answer: (B)

$\frac { 1 } { 3 } A \rho g h$

Answer 2

Thrust on lamina = pressure at centroid × Area

= $\frac { h \rho g } { 3 } \times A$=