J & K CET Engineering J and K - CET Engineering Solved Paper-2010

  • question_answer
    Two particles of masses \[1\text{ }kg\]and \[\text{2 }kg\] are located at \[{{x}_{1}}=0,\] \[{{y}_{1}}=0\] and \[{{x}_{2}}=1,\]\[{{y}_{2}}=0\] respectively. The centre of mass of the system is at.

    A)  \[x=1;\,\,y=2\]     

    B)  \[x=2;\,\,y=1\]

    C)  \[x=\frac{1}{3};\,\,y=\frac{2}{3}\]

    D)  \[x=\frac{2}{3};\,\,y=\frac{1}{3}\]

    E) None of these

    Correct Answer: E

    Solution :

    \[{{x}_{CM}}=\frac{{{m}_{1}}{{x}_{1}}+{{m}_{2}}{{x}_{2}}}{{{m}_{1}}+{{m}_{2}}};\,\,{{y}_{CM}}=\frac{{{m}_{1}}{{y}_{1}}+{{m}_{2}}{{y}_{2}}}{{{m}_{1}}+{{m}_{2}}}\] \[=\frac{1\times 0+2\times 1}{3}=\frac{2}{3};y=\frac{1\times 0+2\times 0}{3}=0\] \[\left[ \frac{2}{3},0 \right]\] Hence, no option is correct.


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