Sunday, 17 August 2014

Think 4




Group answer :



My answer : The metal cup is a better thermal conductor thus the hot water at 70 degree celsius will decrease faster to thermal equilibrium with the cold water as thermal energy is transferred from the hot water to the cold water. Since styrofoam, the material which contains the cold water, is a poor thermal conductor, thermal energy would not be gained from the surroundings easily to the cold water at 5 degree celsius. After both water reach thermal equilibrium, they would stay at that constant temperature.

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