A heat conducting rod, 1.6 m long, is made of an aluminum section, 0.90 m long,

Question

A heat conducting rod, 1.6 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 m^2. The aluminum end and the copper end are maintained at temperatures of 30 degrees Celsius and 170 degrees Celsius, 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) 10.0 W B)7.9 W C) 9.0 W D) 11 W E)12 W Please explain.

Explanation / Answer

Q = kA?Tt/L k values were all given A = 0.0004m2 ?T = 170-30 = 140C L=1.6m find Q

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