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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    A body rolls down an inclined plane. If ifs kinetic energy of rotation is 40% of its kinetic energy of translation, then the body is

    A)  solid cylinder  

    B)  solid sphere

    C)  disc                                      

    D)  ring

    Correct Answer: B

    Solution :

                     \[\frac{1}{2}I{{\omega }^{2}}=40%\]of \[\frac{1}{2}m{{v}^{2}}\] \[\frac{1}{2}I{{\omega }^{2}}=\frac{400}{100}\left( \frac{1}{2}m{{r}^{2}}{{\omega }^{2}} \right)\] \[I=\frac{2}{5}m{{r}^{2}}\] So, the body is solid sphere.


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