問題詳情
28、 Your heart beats at the rate of 70 times per minute, each beat pumping about 60 cm3of fluidagainst 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, theblood is accelerated, and there are frictional losses and other factors involved.)
(A) 9.68×101J
(B) 9.68×102J
(C) 9.68×103J
(D) 9.68×104J
參考答案
答案：D
難度：適中0.5
統計：A(0),B(1),C(0),D(1),E(0)