a dish of food at 42C and heat capacity 800JC is cooled in a refrigerator.The temperatures of the room and refrigerator are 18C and 4C respectively.What is the minimum energy which has to be removed from the food by the refrigerator?
WHY IT'S ANSWER IS 11200J??
phy 1
2006-12-16 10:04 pm
回答 (1)
2006-12-17 1:10 am
✔ 最佳答案
因為food可以係room度放到18度先放入雪櫃所以food 既initial temperature 係 18
E = mc△T
= 800 (18-4)
= 11200J
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