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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Engineering Mechanics

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

    A) \[\frac{\omega M}{M+m}\]                    

    B) \[\frac{\omega (M+2M)}{M}\]

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

    D) \[\frac{\omega M}{M+2m}\]

    Correct Answer: A

    Solution :

    \[M{{R}^{2}}\omega =(M+2m)\,{{R}^{2}}{{\omega }_{1}}\] \[{{\omega }_{1}}=(M\omega /[M+2m]\,\]


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