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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Pressure and Density

  • question_answer
    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)            \[\frac{1}{2}A\rho gh\]    

    B)            \[\frac{1}{3}A\rho gh\]    

    C)            \[\frac{1}{6}A\rho gh\]    

    D)            \[\frac{2}{3}A\rho gh\]

    Correct Answer: B

    Solution :

                       Thrust on lamina = pressure at centroid × Area                             = \[\frac{h\rho g}{3}\times A\]=\[\frac{1}{3}A\rho gh.\]


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