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Five perfectly insulating cups contain equal volumes of water all initially at 90°C. To each cup...

Five perfectly insulating cups contain equal volumes of water all initially at 90°C. To each cup is added a different metal block all with initial temperature of 25°C and equal mass. The metals are copper, silver, aluminum, lead, and iron. Which cup ends with the coolest water after thermal equilibrium has been established? Neglect any energy transfer into or away from the cups.

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