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 :

1.50  1.70 2.35 3.0

1.70

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