28、 Your heart beats at the rate of 70 times per minute, each beat pumping about 60 cm3
of fluid
against a pressure of 120 mmHg. How much expansion work does the heart do in a day?
(Note: The heart work does much more work than this. The heart muscles are contracting, the
blood is accelerated, and there are frictional losses and other factors involved.)
(A) 9.68×101
J
(B) 9.68×102
J
(C) 9.68×103
J
(D) 9.68×104
J
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