Question: Two iron slabs are each 25 cm thick. Initially one is at tem- perature 100C throughout and the other is at temperature 0C. At

Two iron slabs are each 25 cm thick. Initially one is at tem- perature 100C throughout and the other is at temperature 0C. At time t 0 they are placed face to face, and their outer faces are kept at 0C. (a) Use the result of Prob- lem 15 to verify that after a half hour the temperature of their common face is approximately 22C. (b) Suppose that the two slabs are instead made of concrete. How long will it be until their common face reaches a temperature of 22C?

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