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Suppose that the iron slab below is $40$ cm wide and $70$ cm high.

The temperatures are $T_1=65C$ and $T_2=43C.$

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Determine $Q_{\text{c}\text{o}\text{n}\text{d}}^{}($in KW$)$ if the thickness of the slab is $2$ cm $.$

The thermal conductivity iron$*$ for a range of temperatures is given below

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Solve part b plz