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Get Full Access to College Physics - 1 Edition - Chapter 15 - Problem 47pe
Get Full Access to College Physics - 1 Edition - Chapter 15 - Problem 47pe

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# (a) On a winter day, a certain house loses 5.00×108 J of

ISBN: 9781938168000 42

## Solution for problem 47PE Chapter 15

College Physics | 1st Edition

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Problem 47PE

Problem 47PE

(a) On a winter day, a certain house loses 5.00×108 J of heat to the outside (about 500,000 Btu). What is the total change in entropy due to this heat transfer alone, assuming an average indoor temperature of 21.0º C and an average outdoor temperature of 5.00º C ? (b) This large change in entropy implies a large amount of energy has become unavailable to do work. Where do we find more energy when such energy is lost to us?

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Solution  47PE

1.   the total change in the entropy is  9.78x104 J/K
2. In order to gain more energy, we must generate it from things within the house, like a heat pump, human bodies, and other appliances. As you know, we use a lot of energy to keep our houses warm in the winter, because of the loss of heat to the outside.

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