A heat conducting rod,0.90 m long,is made of an aluminum section,0.20 m long,and a copper section,0.70 m long.Both sections have a cross-sectional area of 0.0004 m2.The aluminum end and the copper end are maintained at temperatures of 30ºC and 230ºC,respectively.The thermal conductivities of aluminum and copper are 205 and 385 W/m ∙ K,respectively.The temperature of the aluminum-copper junction in the rod,in ºC,is closest to:

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The Answer of A heat conducting rod,0.90 m long,is made of an aluminum section,0.20 m long,and a copper section,0.70 m long.Both sections have a cross-sectional area of 0.0004 m2.The aluminum end and the copper end are maintained at temperatures of 30ºC and 230ºC,respectively.The thermal conductivities of aluminum and copper are 205 and 385 W/m ∙ K,respectively.The temperature of the aluminum-copper junction in the rod,in ºC,is closest to:

A Heat Conducting Rod,0