A heat conducting rod,1.60 m long and wrapped in insulation,is made of an aluminum section that is 0.90 m long and a copper section that is 
Long.Both sections have a cross-sectional area of 
The aluminum end and the copper end are maintained at temperatures of 
And 
Respectively.The thermal conductivities of aluminum and copper are 205 W/m ∙ K (aluminum) and 385 W/m ∙ K (copper) .At what rate is heat conducted in the rod under steady state conditions?
A) 9.0 W
B) 7.9 W
C) 10 W
D) 11 W
E) 12 W
Correct Answer:
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