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As asbestos pad, square in cross-section, measure 0.05 m on a side and increases linearly to 0.1 m on the other side. The lenght  of the pad is 0.15 m. If the small end is held at 600 K the larger end at 300 K, what will be the heat flow if the other four sides are insulated? Assume one dimensional heat flow. Thermal conductivity of asbestos is 0.173 W/mK.

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