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) 9.68X101 J (B) 9.68x102 J (C) 9.68x103 J (D) 9.68x104 J
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