MCAT Physics Question 34: Answer and Explanation
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Question: 34
4. What is the final temperature of a 5 kg silver pendant that is left in front of an electric heater, absorbing heat energy at a rate of 100 W for 10 minutes? Assume the pendant is initially at 20°C and that the specific heat of silver is 
- A. 29°C
- B. 59°C
- C. 72°C
- D. 100°C
Correct Answer: C
Explanation:
To answer this question, first remember that watts are equal to joules per second; in other words, power is energy transfer over time. In 10 minutes, the pendant absorbs the following amount of energy:
Now we can find the final temperature from this equation:
The final temperature is thus 20 + 52 = 72°C.