A Heat Conducting Rod,1

Multiple Choice

A heat conducting rod,1.60 m long,is made of an aluminum section,0.90 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 30°C and 170°C,respectively.The thermal conductivities of aluminum and copper are 205 and 385 W/m ∙ K,respectively.The rate at which heat is conducted in the rod is closest to:

A) 9.0 W
B) 7.9 W
C) 10 W
D) 11 W
E) 12 W