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Two Bars, a and B, Each of Length 2

question 29

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Two bars, A and B, each of length 2.0 m and cross sectional area 1.0 m2, are placed end to end as shown in the figure. Two bars, A and B, each of length 2.0 m and cross sectional area 1.0 m<sup>2</sup>, are placed end to end as shown in the figure.   The thermal conductivities of the bars are k<sub>A</sub> = 439 J/(s . m . K)  and k<sub>B</sub> = 887 J/(s . m . K) , respectively. The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K. -How much heat passes the interface between A and B in 6.0 s? A) 6.0 × 10<sup>4</sup> J B) 1.5 × 10<sup>3</sup> J C) 1.2 × 10<sup>5</sup> J D) 8.8 × 10<sup>4</sup> J E) 3.0 × 10<sup>4</sup> J The thermal conductivities of the bars are
kA = 439 J/(s . m . K) and kB = 887 J/(s . m . K) , respectively. The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K.
-How much heat passes the interface between A and B in 6.0 s?


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