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JCECE Engineering JCECE Engineering Solved Paper-2006

  • question_answer
    The work done by the centripetal force \[F\] when the body completes one rotation around the circle of radius \[R\] is:

    A) \[2\pi RF\]                          

    B) \[2RF\]

    C)  \[RF\]                                  

    D)  \[zero\]

    Correct Answer: D

    Solution :

    Key Idea: Work done\[(W)\]=Force\[(F)\]\[\times \]displacement\[(d)\] For a body rotating in circular motion, centripetal force is directed towards the centre of the circle when body completes one rotation, its displacement is zero, hence                 Work done \[=\] force \[\times \] displacement                 \[W=F\times 0=0\]


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