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AMU Medical AMU Solved Paper-1999

  • question_answer
    A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle\[\theta \]with verticle edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

    A)  \[2\pi rT+W\]

    B)  \[2\pi rT\cos \theta -W\]

    C)  \[2\pi rT\cos \theta +W\]

    D)  \[W-2\pi rT\cos \theta \]

    Correct Answer: C

    Solution :

    : Weight of disc = upthrust\[+\]force due to T \[=W=2\pi rT\cos \theta \] \[=2\pi rT\cos \theta +W\]


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