College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
Chapter 11, Problem 4P
(a)
To determine
The amount of joules of energy that are equivalent of one jelly doughnut.
(b)
To determine
The number of stairs climbed to convert the food energy to equivalent mechanical energy.
(c)
To determine
The number of stairs climbed to convert the food energy to equivalent mechanical energy if the body is 25% efficient.
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Students have asked these similar questions
A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast.
(a) How many joules of energy are the equivalent of one jelly doughnut?
2192.4
X
Your response is off by a multiple of ten. 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.
8.67
X
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs
(c) If the human body is only 26% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her
breakfast?
9
X
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs
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 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, how many stairs must the woman climb to work offher breakfast?
A food calorie is a unit of energy such that 1 food calorie = 4184 J. This means that a person that burns energy with a power of 4184 W would burn one food calorie every second. A more typical human power rate is 90 W (called the basal metabolic rate). At this rate, how many calories are burned per second (or alternatively, how many seconds does it take to burn 1 calorie)?
Chapter 11 Solutions
College Physics
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