Physics for Scientists and Engineers 10th Edition Β· The First Law of Thermodynamics Β· Problem 1.
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Serway & Jewett β The First Law of Thermodynamics: Problem 1.
A 55.0-kg woman 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 steps must the woman climb on a very tall stairway to change the gravitational potential energy of the womanβEarth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15.0 cm. (c) If the human body is only 25.0% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast?
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Given: 15.0 cm
Find: (a) How many joules of energy are the equivalent of one jelly do; (b) How many steps must the woman climb on a very tall stairway; (c) If the human body is only 25
This problem covers key concepts in The First Law of Thermodynamics from Physics for Scientists and Engineers 10th Edition by Serway & Jewett. The step-by-step solution involves applying fundamental principles and systematic analysis to arrive at the correct answer. Full solution available with a Solution Pass.
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Physics for Scientists and Engineers Β· 10th Edition
Author: Serway & Jewett
Publisher: Cengage
Chapter: The First Law of Thermodynamics