A triangular lamina of area \( A \) and height \( h \) is immersed in a liquid of density \( \rh...

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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) \( \frac{1}{2} \mathrm{~A} \rho g \mathrm{~h} \)
(b) \( \frac{1}{3} \) Apgh
(c) \( \frac{1}{6} \mathrm{~A} \rho g h \)
(d) \( \frac{2}{3} A \rho g h \)
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