Question

In each heart beat, a heart pumps $80ml$ of blood at an average pressure of $100mm$ of $Hg$. Assuming $60$ heart beats per second, the power output of the heart is $({\rho }_{Hg}=13.6\times {10}^{3}kg{m}^{-3})(g=9.8m{s}^{-2})$.

• A. $60.97W$
• B. $63.97W$
• C. $1.12W$
• D. $83.97W$

Answer 1

Answer: (B)

$63.97W$

Power=$P\times \Delta V\times beatrate$

$\rho gh\Delta V\times 60$

$13.6\times {10}^3\times 9.8\times 100\times {10}^{-3}\times 80\times {10}^{-6}\times 60=63.97W$