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JEE Main & Advanced Physics Two Dimensional Motion Question Bank Uniform Circular Motion

  • question_answer
    A sphere of mass \[m\] is tied to end of a string of length \[l\] and rotated through the other end along a horizontal circular path with speed \[v\]. The work done in full horizontal circle is            [CPMT 1993; JIPMER 2000]

    A)             0         

    B)             \[\left( \frac{m{{v}^{2}}}{l} \right)\,.\,2\pi l\]

    C)             \[mg\,.\,2\pi l\]

    D)                      \[\left( \frac{m{{v}^{2}}}{l} \right)\,.\,(l)\]

    Correct Answer: A

    Solution :

                    Work done by centripetal force in uniform circular motion is always equal to zero.


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