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

  • question_answer
    A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec.  If the radius of the circle is 2 m, then tension in the string when the body is at the top of the circle, is                                     [CBSE PMT 1999]

    A)             41.56 N

    B)                      89.86 N

    C)             109.86 N

    D)                      115.86 N

    Correct Answer: D

    Solution :

                    Tension at the top of the circle,\[T=m{{\omega }^{2}}r-mg\]             \[T=0.4\times 4{{\pi }^{2}}{{n}^{2}}\times 2-0.4\times 9.8=115.86\,N\]


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