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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of of mercury. If the density of mercury be and then the power of heart in watt is: (1) (2) (3) (4)

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Solution: (2)
\begin{aligned} \text { Power } &=\vec{F}, \vec{V}=P A \vec{V}=\rho g h A V \\ &=13.6 \times 10^{3} \times 10 \times 150 \times 10^{-3} \times 0.5 \times 10^{-3} /_{60} \text { watt } \\ =& \frac{102}{60} \text { watt }=1.70 \text { watt. } \end{aligned}