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Suppose a 7 kg piece of iron (c=450 J/Kg K) at 620 K is put in thermal contact with a 5 kg piece of lead

Suppose a 7 kg piece of iron (c=450 J/Kg K) at 620 K is put in thermal contact with a 5 kg piece of lead (c=130 J/Kg K) at 200 K, find the final temperature of the two metals.

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