A 12-cm-Iong bar with a square cross-section, as shown in Fig. P17-146, consists of a 1-cm-thick copper layer (k = 380 W/m·K) and a 1-cm-thick epoxy composite layer (k = 0.4 W/m·K). Calculate the rate of heat transfer under a thermal driving force of 50°C, when thc direction of steady one-dimensional heat transfer is (a) from front to back (i.e., along its length), (b) from left to right, and (c) from top to bottom.
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