JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer 43) A wheel is rotating at 900 r.p.m. about its axis. When power is cut off it comes to rest in 1 minute. The angular retardation in rad\[/{{s}^{2}}\] is

    A)  \[\pi /2\]                       

    B)  \[\pi /4\]

    C)  \[\pi /6\]                       

    D)  \[\pi /8\]

    Correct Answer: A

    Solution :

     Angular retardation, \[\alpha =\frac{{{\omega }_{2}}-{{\omega }_{1}}}{t}=\frac{2\pi ({{n}_{2}}-{{n}_{1}})}{t}=\frac{2\pi (0-900/60)}{60}=\frac{\pi }{2}rad/{{s}^{2}}.\]

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