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NEET Physics Rotational Motion NEET PYQ-Rotational Motion

  • question_answer
    A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere? [NEET - 2018]

    A) Rotational kinetic energy

    B) Moment of inertia

    C) Angular velocity

    D) Angular momentum

    Correct Answer: D

    Solution :

    [d] \[{{\tau }_{ex}}=0\]
    \[\text{So,}\frac{\text{dL}}{\text{dt}}\text{=0}\]
    i.e. L = constant
    So angular momentum remains constant.


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