The heart does about 1.0 J of work while pumping blood into the aorta during eac
ID: 1639046 • Letter: T
Question
The heart does about 1.0 J of work while pumping blood into the aorta during each heartbeat. Determine the work done by the heart in pumping blood during a lifetime. Assume an average rate of 70 beats per minute for a person who lives to age of 71 years. Express your answer to two significant figures and include the appropriate units. If all of that work was used to lift a person, to what height above the Earth level could a person be lifted? Assume that the energy can be converted to gravitational potential energy with 100% efficiency and the mass of the person is 69 kg. For this problem suppose that the free-fall acceleration does not vary with altitude. Express your answer to two significant figures and include the appropriate units.Explanation / Answer
no of beats in one minute = 70
no of beats per hour = 60*70
no of beats per day = 24*60*70
no of beats per year = 365*24*60*70
no of beats per 71 years =71*365*24*60*70
=2.612*10^9
so, workdone in life time =1J *2.612*10^9 = 2.612*10^9 J
b) work = mgh
2.612*10^9 J= (69 kg) (9.8 m/s2) h
h=3.862*10^6 m
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