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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 |
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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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