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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2003

  • question_answer
    When a horizontal disc is rotated about its vertical axis and sand is dropped on it, then its angular velocity will

    A)  decrease                           

    B)  increase

    C)  remain constant

    D)  first decrease and then increase

    Correct Answer: A

    Solution :

    Angular momentum of disc \[J=I\omega =\] constant When sand is dropped on disc, moment of inertia\[I\] of disc increases, so, angular velocity \[\omega \propto \frac{1}{I}\] decreases.


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