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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    A sphere of radius R is gently dropped into liquid of viscosity \[\eta \] in a vertical uniform tube. It attains a terminal velocity v. Another sphere of radius 2R when dropped into the same liquid, will attain its terminal velocity

    A)  \[v\]              

    B)  \[2v\]

    C)  \[4v\]              

    D)  \[9v\]

    Correct Answer: C

    Solution :

    Terminal velocity \[v\propto {{r}^{2}}\] \[\therefore \] \[\frac{v'}{v}=\frac{{{(2R)}^{2}}}{{{(R)}^{2}}}\] or \[v'=4v\]


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