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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2014)

  • question_answer
    When sand is heaped on a rotating disc, its angular velocity will

    A)  become zero              

    B)  increase

    C)  remain constant         

    D)  decrease

    Correct Answer: D

    Solution :

    \[l\,\omega \] is constant in the angular motion. \[l=M{{R}^{2}}\] When sand is poured and heaped on the disc, mass increases and so l increases. \[l\,\omega \] = Constant Hence, if l increases, \[\omega \] decreases.


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