A 52-kg woman eats a 640 Calorie (640 kcal) jelly doughnut for breakfast. (a) How many...
A 52-kg woman eats a 640 Calorie (640 kcal) jelly doughnut for
breakfast.
(a) How many joules of energy are the equivalent of one jelly
doughnut?
_________ J
(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 30% efficient in converting
chemical potential energy to mechanical energy, how many steps must
the woman climb to work off her breakfast?
_________ stairs
Homework Answers
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A 52-kg woman eats a 640 Calorie (640 kcal) jelly doughnut for
breakfast.
(a) How many...
A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for...
A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast: (A) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (C) If the human body is only 25% efficient in converting chemical energy to mechanical energy,...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work 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 28% efficient in converting chemical energy to mechanical...
a 54kg woman cheats on her diet and eats a 615 calorie(615 kcal) jelly doughnut for...
a 54kg woman cheats on her diet and eats a 615 calorie(615 kcal) jelly doughnut for breakfast. a) how many joules of energy are the equivalent of one jelly doughnut? b) how many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? assume the height of a single stair is 15cm. c) if the human body is only 20% efficient in converting chemical energy to mechanical energy, how...
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A 148 kg student eats a 200 Calorie doughnut. To “burn it off”, he decides to climb the steps of a tall building. (1 food Calorie = 103 Calories.) How high would he have to climb to expend an equivalent amount of work? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m.
I need help figuring out what concepts to apply to this question: Sara, who weighs 66.0...
I need help figuring out what concepts to apply to this question: Sara, who weighs 66.0 kg, enjoys a 538-Calorie (538 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. She wishes to maintain her weight, so she decides to work out before going to her fitness group's weekly meeting. If the height of a single stair is 12.0 cm, and her body is only 33% efficient in converting chemical energy to mechanical energy, determine the number of stairs...
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A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast: (A) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (C) If the human body is only 25% efficient in converting chemical energy to mechanical energy,...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work 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 28% efficient in converting chemical energy to mechanical...
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