17. part a) If the temperature in the kitchen is decreased, is the cost (work ne

Question

17. part a) If the temperature in the kitchen is decreased, is the cost (work needed) to freeze a dozen ice cubes greater than, less than, or equal to what it was before the kitchen was cooled? a) greater than b) less than c) equal to 17. part b) Choose the best explanation from among the following: a) The same amount of ice is frozen in either case, which requires the same amount of heat to be removed and hence the same amount of work. b) The difference in temperature between the inside and the outside of the refrigerator is decreased, and hence less work is required to freeze the ice. c) Cooling the kitchen means that the refrigerator must do more work, both to freeze the ice cubes and to warm the kitchen.

Explanation / Answer

part a -> less work is required part b -> b is best option explanation the work of a refrigerator is to extract heat from the content that is water and convert it to ice thus throwing the heat to the surroundings if the surrounding is at a higher temp then more work is needed to cause this heat transfer as compared to a case when the environment is at a lower temp so the cooling load is higher in summers than in winters for the same amount of work.

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