The human heart is the pump for moving blood around the body. its average power

Question

The human heart is the pump for moving blood around the body. its average power oputput (over many beats)is about 2.0 W and it pumps blood at an overall average speed of 0.3 m/s into the output aorta channel.

A) compute the avg. force with which the heart moves the blood into the aorta.

B) Assuming 100% convesion efficeny from food enegery into mechanical energy, calculate the minimum number of food calories required in a day to keep the heart pumping with the avg. mechanical power output of 2 watts.
recall one food calorie=4,190 Joules. there are 864000sec in one day.

Explanation / Answer

for the second part, E=power*time E=2*864000=1728000J But this is in joules, we know that,4190 J=1cal ->number of calories=1728000/4190=412.41calories hope it helps.god bless you.

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