Work Energy And Power Question 290
Question: The heart of man pumps 5 liters of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be $ 13.6\times 10^{3}kg/m^{3} $ and $ g = 10m/s^{2} $ then the power of heart in watt is:
Options:
A) 2.35
B) 3.0
C) 1.50
D) 1.70
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Power $ \vec{F}.\vec{V} = PA\vec{V} =\rho ghAV $
$ [ \because \frac{F}{A}andP=\rho gh ] $
$ = 13.6\times 10^{3}\times 10\times 150\times 1{0^{-3}}\times 0.5\times 1{0^{-3}}/60 $
$ =\frac{102}{60}=1.70watt $
