question_answer 60)

                  The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times in a minute.                

Answer:

                  Total work done by the heart, when it beats 72 time, \[W=0.5\,J\,\times 72=36\,J\]                 Time, \[t=1\] minute = 60 s                 \[\therefore \]\[\text{Power}\,\,=\,\frac{W}{t}\,=\frac{36}{60}=\,0.6\,\,W\]