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7. Dos placas metlicas, una de acero y la Otra de aluminio, se sueldan juntas; el area comn de ambas placas es 60 cma

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7. Dos placas metlicas, una de acero y la Otra de aluminio, se sueldan juntas; el area comn de ambas placas es 60 cma y sus espesores respectivos son 2 y 3 mm. Las temperaturas sobre las superficies externas de las placas son de 100 oc y O 'C, respectivamente. Determinar la temperatura de la unin. O,12cal / s.cm.'C, O,5cal / s.cm.'C k ciu min io A) 26,5 oc B) 58,2 oc C) 65,90C D) 78,3 oc E) 81,90C

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