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NEET NEET SOLVED PAPER 2015 (Re)

  • question_answer
    The heart of a man pumps 5 L of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be  \[13.6\times {{10}^{3}}kg/{{m}^{3}}\]   and \[g=10m/{{s}^{2}}\], then the power of heart in watt is

    A)  1.70                      

    B)  2.35                      

    C)  3.0                        

    D)  1.50

    Correct Answer: A

    Solution :

    Given, pressure =150 mm of Hg Pumping rate of heart of a man \[=\frac{dV}{dt}=\frac{5\times {{10}^{-3}}}{60}{{m}^{3}}/s\] Power of heart, = \[P.\frac{dV}{dt}=\rho gh.\frac{dV}{dt}[p=\rho gh]\] \[\Rightarrow \,\,\frac{(1.36\times {{10}^{3}}kg/{{m}^{3}})(10)\times 0.15\times 5\times {{10}^{-3}})}{60}=1.70W\]


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