Question

Q. A certain person's heart beats 1.2 times per second and pumps 1.0x10^-4 m^3 of blood per beat against an average pressure of 14 kPs. The power output of the heart is...
A.1.2 W ,B. 1.4W ,C. 1.7W ,D. 12W

Answer 1

Answer:

option c :- 1.7W

Explanation:

power = energy comsumed / time ( sec )

energy used here..is work done by the heart okay!

soo..work done = pressure*∆volume ..

now 1.2 beats per second..

1.2 * 10^-4 = total blood pump in a second

12 *10^-5 m^3 of blood in a second

work done = 14000*12*10^-5 = 1.68J

power output = 1.68J/1sec = approximately 1.7 Watts

hope you understand