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

  • question_answer
    Water is flowing in a pipe of diameter 4 cm with a velocity 3 m/s. The water then enters into a tube of diameter 2 cm. The velocity of water in the other pipe is           [BCECE 2005]

    A)            3 m/s                                       

    B)            6 m/s

    C)            12 m/s                                    

    D)            8 m/s

    Correct Answer: C

    Solution :

                       \[{{a}_{1}}{{v}_{1}}={{a}_{2}}{{v}_{2}}\] Þ \[\frac{{{v}_{2}}}{{{v}_{1}}}=\frac{{{a}_{1}}}{{{a}_{2}}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{2}}\]            Þ \[{{v}_{2}}=3\times {{(2)}^{2}}\]= 12 m/s


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