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NEET2015PhysicsMechanical Properties of FluidsActual

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   k g   m - 3 and g = 10   m   s - 2 , then the power of heart in watt is:

Options

  1. A2.35
  2. B3.0
  3. C1.50
  4. D1.70

Correct answer

D. 1.70

Step-by-step solution

( aligned & Pressure = P =150 ~mm Hg & Pumping rate = dV dt = 5 10⁻³ 60 ~m ^3 / s & Power of heart = P. dV dt = gh dV dt & = (13.6 10^3 )(10) (0.15) 5 10⁻³ 60 & = 13.6 5 0.15 6 =1.70 watt aligned )

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