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

  • question_answer
    Certain neutron stars are believed to be rotating at about \[1\,rev/\sec \]. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be [NCERT 1982]

    A)             \[20\times {{10}^{8}}m/{{\sec }^{2}}\]  

    B)             \[8\times {{10}^{5}}m/{{\sec }^{2}}\]

    C)             \[120\times {{10}^{5}}m/{{\sec }^{2}}\]

    D)             \[4\times {{10}^{8}}m/{{\sec }^{2}}\]

    Correct Answer: B

    Solution :

                    \[a={{\omega }^{2}}r=4{{\pi }^{2}}{{n}^{2}}r=4{{\pi }^{2}}\times {{1}^{2}}\times 20\times {{10}^{3}}\] \ a=\[8\times {{10}^{5}}\ m/{{\sec }^{2}}\]


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