JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Pascal's Law and Archimedes Principle

  • question_answer
    The fraction of a floating object of volume \[{{V}_{0}}\] and density \[{{d}_{0}}\] above the surface of a liquid of density d will be

    A)            \[\frac{{{d}_{0}}}{d}\]      

    B)            \[\frac{d{{d}_{0}}}{d+{{d}_{0}}}\]                                   

    C)            \[\frac{d-{{d}_{0}}}{d}\]\[\]  

    D)            \[\frac{d{{d}_{0}}}{d-{{d}_{0}}}\]

    Correct Answer: C

    Solution :

                       For the floatation \[{{V}_{0}}{{d}_{0}}g={{V}_{in}}\ d\ g\]   Þ  \[{{V}_{in}}={{V}_{0}}\frac{{{d}_{0}}}{d}\] \  \[{{V}_{out}}={{V}_{0}}-{{V}_{in}}={{V}_{0}}-{{V}_{0}}\frac{{{d}_{0}}}{d}\]\[={{V}_{0}}\left[ \frac{d-{{d}_{0}}}{d} \right]\] Þ \[\frac{{{V}_{out}}}{{{V}_{0}}}=\frac{d-{{d}_{0}}}{d}.\]


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