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# Suppose a woman does 500 J of work and 9500 J of heat ISBN: 9781938168000 42

## Solution for problem 5PE Chapter 15

College Physics | 1st Edition

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Problem 5PE

Problem 5PE

Suppose a woman does 500 J of work and 9500 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) (b) What is her efficiency?

Step-by-Step Solution:
Step 1 of 3

Solution 5PE

(a)

Substitute -9500 J for Q, and 500 J for W solve for internal energy,

ΔU= (-9500J) - 500 J

= -10000 J

the internal energy decreases by 10,000 J.

(b)

Convert efficiency in percentage,

Efficiency = (0.05) (100)

= 5 %

efficiency of women is 5 %  .

Step 2 of 3

Step 3 of 3

##### ISBN: 9781938168000

This textbook survival guide was created for the textbook: College Physics , edition: 1. The full step-by-step solution to problem: 5PE from chapter: 15 was answered by , our top Physics solution expert on 07/07/17, 04:39PM. College Physics was written by and is associated to the ISBN: 9781938168000. This full solution covers the following key subjects: Energy, transfer, internal, decrease, efficiency. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. Since the solution to 5PE from 15 chapter was answered, more than 654 students have viewed the full step-by-step answer. The answer to “Suppose a woman does 500 J of work and 9500 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) (b) What is her efficiency?” is broken down into a number of easy to follow steps, and 52 words.

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Suppose a woman does 500 J of work and 9500 J of heat