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 × 103 kg/m3 and g = 10 m/s2 then the power of heart in watt is :
Answer & explanation
Correct answer: option 2
P' = P\(\frac{dV}{dt}\)
= \(\rho g h)\frac{dV}{dt}\)
\(\rho = 13.6 × 10^3 kg/m^3\) ; g = 10 m/s2 ; h = 150 x 10-3 m ; \(\frac{dV}{dt} = \frac{5 litres}{60 s}\)
P' = 1.70 W