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Question: Answered & Verified by Expert
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
PhysicsMechanical Properties of FluidsJEE Main
Options:
  • A $\frac{1}{2}$ Apgh
  • B $\frac{1}{3} A \rho g h$
  • C $\frac{1}{6} A \rho g h$
  • D $\frac{2}{3} A \rho g h$
Solution:
2428 Upvotes Verified Answer
The correct answer is: $\frac{1}{3} A \rho g h$
Thrust on lamina $=$ pressure at centroid $\times$ Area
$=\frac{h \rho g}{3} \times A=\frac{1}{3} A \rho g h$.

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