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JEE Main & Advanced Physics Two Dimensional Motion Question Bank Non-uniform Circular Motion

  • question_answer
    A block of mass \[m\] at the end of a string is whirled round in a vertical circle of radius \[R\]. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is       [DCE 1999, 2001]

    A)             \[Rg\]  

    B)             \[{{(Rg)}^{2}}\]

    C)             \[R/g\] 

    D)             \[\sqrt{Rg}\]

    Correct Answer: D

    Solution :

                    At highest point \[\frac{m{{v}^{2}}}{R}=mg\] Þ \[v=\sqrt{gR}\]


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