Two friends $A$ and $B$ are waiting for another friend for tea. $A$ took the tea in a cup and mixed the cold milk and then waits. $B$ took the tea in the cup and then mixed the cold milk when the friend comes. Then the tea will be hotter in the cup of
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(a) The rate of heat loss is proportional to the difference in temperature. The difference of temperature between the tea in cup $A$ and the surrounding is reduced, so it loses less heat. the tea in cup $B$ loses more heat because of large temperature difference. Hence the tea in cup $A$ will be hotter.
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