Two iron slabs are each 25 cm thick. Initially one is at tem- perature 100C throughout...

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