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Manipal Engineering Manipal Engineering Solved Paper-2013

  • question_answer
    The energy supplied to Kolkata by the state electricity board during an average November week day was\[40GWh\]. If this energy could be obtained by the conservation of matter, how much mass would have to be annihilated?

    A) \[1.6\,\,g\]

    B)                        \[2.2\,\,g\]

    C) \[4.0\,\,g\]                         

    D) \[1.6\,\,g\]

    Correct Answer: A

    Solution :

    \[E-40GWh=40\times {{10}^{9}}J/s\]      \[(60\times 60)=1.44\times {{10}^{14}}J\]                 \[E=m{{c}^{2}}\] \[m=\frac{E}{{{C}^{2}}}=\frac{1.44\times {{10}^{14}}}{{{(3\times {{10}^{8}})}^{2}}}=1\times {{10}^{3}}kg\] \[m=1.6\,\,g\]


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