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20. A triangular lamina of area A and height h is immersed in a liquid of density

ρ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is

(a)  (1/2) Aρgh                                              (b) (1/3) Aρgh

(c) (1/6) Aρgh                                              (d) (2/3) Aρgh

Answer-b

(4)

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