question_answer

  The human heart does 1.5 3 of work in every beat. How many times per minute does it beat if its power is 2 W? 

Answer:

                                  Here, P = 2 W, t = 1 min = 60s Total work = W = Pt = 2 x 60 s =120 J                    1.5 J work is done in 1 beat  120 J work will be done inbeat Therefore, number of beats per min = 80 beat