Question: On a cold winter day you buy roasted chestnuts from a street vendor. Into the pocket of your down parka you put the change he

On a cold winter day you buy roasted chestnuts from a street vendor. Into the pocket of your down parka you put the change he gives you—coins constituting 9.00 g of copper at -12.0°C. Your pocket already contains 14.0 g of silver coins at 30.0°C. A short time later the temperature of the copper coins is 4.00°C and is increasing at a rate of 0.500°C/s. At this time,
(a) What is the temperature of the silver coins, and
(b) At what rate is it changing?

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