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dT (b) Newton's Law of cooling on exposed surface area S: dt = kS(T Tm), k < 0 Suppose that two cups A and

dT (b) Newton's Law of cooling on exposed surface area S: dt = kS(T Tm), k < 0 Suppose that two cups A and B are filled with coffee at the same time. Initially, the temperature of the coffee is 200F. The exposed surface area of the coffee in cup B is twice the surface area of the coffee in cup A. After 10 min the temperature of the coffee in cup A is 160F. If Tm = 30C, then what is the temperature of the coffee in cup B after 30 min?

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