15.6 Exercise 12

(a) On a winter day, a certain house loses $5 . \text{00} \times \text{10}^{8} \text{ J}$ 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 $\text{21}.\text{0}º\text{ C}$ 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?