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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6 × $10^{3}$ kg/ $m^{3}$ and g = 10 $m / s^{2}$ then the power of heart in watt is

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1.70

3.0

1.50

2.35

answer is C.

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Detailed Solution

Power = pressure x rate of volume pumped per second

$(ρgh) \times (\frac{dv}{dt})$ ; $P = (ρ g h) \times \frac{d v}{d t}$

$= (13.6 \times 10^{3} \times 10 \times 150 \times 10^{- 3}) \times (\frac{5 \times 10^{- 3}}{60}) = 1.7 watt$

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