In Table 7.2 (Energy Expenditure of a 180-Pound Person During Selected Exercises)Links to an external site. in the course textbook, it is claimed that a person climbing stairs expends about 1200 kcal/hr. The maximum human power output for short-term effort is approximately 1200 W (remember 1 W = 1 J/s).   Is the value of 1200 kcal/hr a reasonable estimate of average power output by a person climbing stairs?   Note: Power is defined as energy per time, so 1200 kcal/hr has units of energy per time. A watt is the SI unit of power and has units of J/s. So to approach this problem you will need to convert one power measurement into the other.   Group of answer choices It comes out to be 1400 W, which is too high It is impossible to convert kcals into joules since one is an SI unit and the other isn't It comes out to be 1.395 x 103 W, so the value in the table seems reasonable It comes out to be 960 W, that is too high It comes out to be 1.4 W and that is too low

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In Table 7.2 (Energy Expenditure of a 180-Pound Person During Selected Exercises)Links to an external site. in the course textbook, it is claimed that a person climbing stairs expends about 1200 kcal/hr. The maximum human power output for short-term effort is approximately 1200 W (remember 1 W = 1 J/s).

 

Is the value of 1200 kcal/hr a reasonable estimate of average power output by a person climbing stairs?

 

Note: Power is defined as energy per time, so 1200 kcal/hr has units of energy per time. A watt is the SI unit of power and has units of J/s. So to approach this problem you will need to convert one power measurement into the other.

 

Group of answer choices
It comes out to be 1400 W, which is too high
It is impossible to convert kcals into joules since one is an SI unit and the other isn't
It comes out to be 1.395 x 103 W, so the value in the table seems reasonable
It comes out to be 960 W, that is too high
It comes out to be 1.4 W and that is too low
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