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Q.

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:

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a

1.50

b

1.70

c

2.35

d

3.0

answer is B.

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Detailed Solution

Pressure = 150 mm HgPumping rate = dVdt = 5×10-360m3/sPower of heart P.dVdt = ρgh×dVdt= (13.6×103 kg/m3)(10)×(0.15)×5×10-360= 13.6×5×0.156 = 1.70 watt
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