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.
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The whole force of water will act at the centroid of the triangle. This point is at distance of (1/3)h from the top surface of water.
Hence pressure = (1/3) ρgh
∴ Trust acting on lamina = pressure × area
= [{ρgh} / 3] × A
= (1/3) Aρgh
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