Q. If the heart pushes 1 cc of blood in 1 s under pressure 20000$Nm^{- 2}$ ,the power of heart is
A) 0.02 W
B) 400 W
C) 5$\times 10^{- 10}$W
D) 0.2 W
Explanation
(a) Given, pressure=20000$Nm^{- 2}$
Volume=$1cc = 10^{- 6}\ m^{3}$
$\because$Power=pressure×volume per second
$\therefore Power = 20000 \times 10^{- 6}$
$\ p = 0.02\ w$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.