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AP® Physics 1 & 2

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Mixing Liquids: Final Temperature Estimate

APPH12-XU6DT3

A cup of cold coffee is mixed with a cup of hot coffee. The temperature of the hot coffee is twice that of the cold coffee, and the mass of the hot coffee is three times that of the cold coffee.

Which of the following is true?

A

The final temperature of the cold/hot coffee mixture is closer to the initial temperature of the hot coffee than it is the initial temperature of the cold coffee.

B

The final temperature of the cold/hot coffee mixture is closer to the initial temperature of the cold coffee than it is the initial temperature of the hot coffee.

C

The final temperature of the cold/hot coffee mixture is the average temperature of the two initial temperatures (hot and cold).

D

The final temperature of the cold/hot coffee mixture is greater than the initial temperature of the hot coffee.