SAT Subject Physics Practice Question 129: Answer and Explanation

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Question: 129

2. The melting point of copper is 1,080°C and its heat of fusion is 200 kJ/kg. If a copper coin at this temperature is completely melted by the absorption of 2,000 J of heat, what is the mass of the coin?

A.
B.
C.
D.
E.

Correct Answer: D

Explanation:

Phase changes obey the equation Q = mL, where m is the mass of the sample and L is the latent heat of transformation. In this case, we find that

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