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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    A thin circular ring of mass m and radius R is rotating about its axis with a constant angular \[\omega \]. Two objects each of mas m are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity \[\omega =\]

    A)  \[\frac{\omega m}{(m+2m)}\]             

    B)  \[\frac{\omega (m+2m)}{m}\]

    C)  \[\frac{\omega (m-2m)}{(m+2m)}\]                      

    D)  \[\frac{\omega m}{(m+m)}\]

    Correct Answer: A

    Solution :

    As there is no external torque on the body and hence there is no change in angular momentum. \[L=L'\] \[m{{R}^{2}}\omega =(m{{R}^{2}}+2m{{R}^{2}})\omega '\] \[\omega '=\frac{m\omega }{m+2m}\] 


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