A Heat Conducting Rod, 1 $0.70 \mathrm {~m}$ Long Both Sections Have a Cross-Sectional Area Of Wrapped

question 86

Multiple Choice

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 $0.70 \mathrm {~m}$ long. Both sections have a cross-sectional area of $0.00040 \mathrm {~m} ^ { 2 }$ The aluminum end and the copper end are maintained at temperatures of $30 ^ { \circ } \mathrm { C }$ and $170 ^ { \circ } \mathrm { C }$ 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

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