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6 Oct 2020
A 55.0-kg woman eats a 540 Cal (540 kcal) jelly doughnut for breakfast.
(a) How many joules of energy are the equivalent of one jelly doughnut?
(b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume that the height of a single stair is 15.0 cm.
(c) If the human body is only 25% efficient in converting potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast?
A 55.0-kg woman eats a 540 Cal (540 kcal) jelly doughnut for breakfast.
(a) How many joules of energy are the equivalent of one jelly doughnut?
(b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume that the height of a single stair is 15.0 cm.
(c) If the human body is only 25% efficient in converting potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast?
KathLv10
10 Nov 2020
