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A rod, made from an unknown metal, is 1.2-meters long and has a cross-sectional area of 3.0 X 10^-4 m^2. Except for its ends, the rod is insulated, so that no heat escapes through the sides of the rod. The rod conducts heat at a rate equal to or greater than 3.7 J/s, when a temperature difference of 75-degrees C is maintained between the ends. From which metal is the rod made of; Aluminum k=240, Brass k=110, Copper k=390, Iron k=79, Lead k=35, Silver k=420, or Stainless Steel k=14. Topic: Transfer of Heat.

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