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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    The heart of a man pumps \[4\] litres of blood per minute at a pressure of \[130\,\,mm\] of mercury. If the density of mercury is\[13.6\,\,g\,\,c{{m}^{-3}}\], calculate the power of the heart.

    A) \[1.144\,\,W\]                

    B) \[2.145\,\,W\]

    C) \[1.155\,\,W\]      

    D)        \[3.155\,\,W\]

    Correct Answer: C

    Solution :

    \[P=\frac{130\times {{10}^{-3}}\times 13.6\times {{10}^{+3}}\times 9.8\times 4\times {{10}^{-3}}}{60}\]        \[=1.155\,\,W\]


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