After a 5-min workout on a Climb Max stair machine, the readout panel (see figur

Question

After a 5-min workout on a Climb Max stair machine, the readout panel (see figure below) reports that the73-kg user burned19.7 Caloriesand climbed a total of165steps.The chemical potential energy in foods is measured in units called Calories (notice the capital C). This "food Calorie" is equal to 1000 calories.

(a) If each step is14cmin height, how much would the potential energy of the user have changed if she were actually climbing a stairway?

(b) What was her rate of change in potential energy?

(c) At what rate was her metabolism consuming energy?

(d) What is her efficiency in converting the energy in the chemical bonds in her food into potential energy?Ppotential energy/Pmetabolism=

Explanation / Answer

a)potential energy = 0.14*165 *9.8*73=16525.74 J,,,,

b) 16525.74/(5*60) = 55.0858 Watts

c)19.7*4.2/(5*60) = 0.2758 W

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