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BIO Food Calories. The food calorie, equal to 4186 J, is a

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 4E Chapter 7

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 4E

BIO Food Calories. The ?food calorie,? equal to 4186 J, is a measure of how much energy is released when the body metabolizes food. A certain fruit-and-cereal bar contains 140 food calories. (a) If a 65-kg hiker eats one bar, how high a mountain must he climb to “work off” the calories, assuming that all the food energy goes into increasing gravitational potential energy? (b) If, as is typical, only 20% of the food calories go into mechanical energy, what would be the answer to part (a)? (?Note?: In this and all other problems, we are assuming that 100% of the food calories that are eaten are absorbed and used by the body. This is not true. A person’s “metabolic efficiency” is the percentage of calories eaten that are actually used; the body eliminates the rest. Metabolic efficiency varies considerably from person to person.)

Step-by-Step Solution:

Solution 4E Step 1 of 2: The change in gravitational potential energy is,U = mg(y y ) grav f i a) The food energy is equal mg(y y ) f i yf y i (140 food calories )(4182 J/ 1 food calorie) (65 kg)(9.8 m/s ) = 920 m

Step 2 of 2

Chapter 7, Problem 4E is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

The answer to “BIO Food Calories. The ?food calorie,? equal to 4186 J, is a measure of how much energy is released when the body metabolizes food. A certain fruit-and-cereal bar contains 140 food calories. (a) If a 65-kg hiker eats one bar, how high a mountain must he climb to “work off” the calories, assuming that all the food energy goes into increasing gravitational potential energy? (b) If, as is typical, only 20% of the food calories go into mechanical energy, what would be the answer to part (a)? (?Note?: In this and all other problems, we are assuming that 100% of the food calories that are eaten are absorbed and used by the body. This is not true. A person’s “metabolic efficiency” is the percentage of calories eaten that are actually used; the body eliminates the rest. Metabolic efficiency varies considerably from person to person.)” is broken down into a number of easy to follow steps, and 144 words. This textbook survival guide was created for the textbook: University Physics, edition: 13. Since the solution to 4E from 7 chapter was answered, more than 386 students have viewed the full step-by-step answer. This full solution covers the following key subjects: food, Calories, Energy, Person, body. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. University Physics was written by and is associated to the ISBN: 9780321675460. The full step-by-step solution to problem: 4E from chapter: 7 was answered by , our top Physics solution expert on 05/06/17, 06:07PM.

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BIO Food Calories. The food calorie, equal to 4186 J, is a