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 $



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