Help! Newton's Law of Cooling?

  • Thread starter Thread starter Ray
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Ray

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Jim has three coffee cups with 200 ml of water in each. He also has another cup with 100 ml of water in it. He places the cup with 100 ml of water in the microwave along with one of the 200 ml of water cups, and heats them until they boil.

After they are at the same temperature (100 C) Jim takes them out and sets them on a table and records their temperature for the next 20 minutes. Room temperature is about 18.3 C.

Roughly how much did the cups cool per minute?
 
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