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 is 13.6×103kg/m3 and g=10m/s2 , then the power of heart in Watts is
A
1.50
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B
1.70
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C
2.35
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D
3.0
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Solution
The correct option is B1.70 ρ=13.6×103kgm3, h=150×10−3m, Av=5×10−360
Power P=→F⋅→v=PAv=ρgh×Av =(13.6×103)×10×(150×10−3)×(5×10−360) =1.7Watt