A 62-kg woman eats a 620 Calorie (620 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 the height of a single stair is 15 cm. stairs (c) If the human body is only 27% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? stairs Need Help? Read It

A 62-kg woman eats a 620 Calorie (620 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 the height of a single stair is 15 cm. stairs (c) If the human body is only 27% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? stairs Need Help? Read It