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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    A rain drop of radius 0.3 mm has a terminal velocity 1 m/s in the air. The viscosity of air is\[18\times {{10}^{-5}}P.\] The viscous force on it is

    A)  \[101.73\times {{10}^{-4}}\]dyne            

    B)  \[101.73\times {{10}^{-5}}\]dyne

    C)  \[16.95\times {{10}^{-5}}\]dyne              

    D)  \[16.95\times {{10}^{-4}}\]dyne

    E)  \[1.6\times {{10}^{-4}}\]dyne

    Correct Answer: A

    Solution :

                    From Stokes law \[F=6\pi \eta rv\] \[F=6\pi \times 18\times {{10}^{-5}}\times \left( \frac{0.3}{10} \right)\times 100\,\text{dyne}\] \[F=0.01073\,\,\text{dyne}\] \[F=101.73\times {{10}^{-4}}\,\text{dyne}\]


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