1.

14. The heart of a man pumps 5 litres of bloodthrough the arteries per minute at a pressure of150 mm of mercury. If the density of mercury be13.6 103 kg/m3 and g = 10 m/s2 then the powerof heart in watt is[Re-AIPMT-2015)(1) 1.50(2) 1.70(3) 2.35(4) 3.0

Answer»

WORK DONE BY THE HEART=PV

WHERE,P is pressure and V is the volume of blood being pumped.

therefore,P=hpg

here,h=height of mercury=150mm

= .15m

p=density of mercury=13.6*10^3kg/m^3

g=10m/s^2

also,V=5000 i.e, 5*10^-3m^3

now, P=W/T=hpgv/t

where,t=60

therefore, putting all these values we get,P=1.7W

THEREFORE,THE POWER OF HEART IS 1.7M

option 2 is the correct



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