SAT Subject Physics Practice Question 514: Answer and Explanation

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Question: 514

15. If 50g of water at a temperature of 30°C is added to 200g of water at a temperature of 100°C,what will the new temperature of the water be?

A. 68°C
B. 80°C
C. 74°C
D. 86°C
E. 92°C

Correct Answer: D


The correct answer is (D). This is a calorimetry problem (cmΔT)cold = (cmΔT)hot. The specific heats are the same for both hot and cold water, which may be factored out of the problem, leaving (mΔT)cold = (mΔT)hot. The answer is 86°C.

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