SAT Subject Physics Practice Question 554: Answer and Explanation
10. Object A (which is cold) is placed on top of object B (which is hot) in a closed system. Which of the following is the best description of what occurs in the system?
I. Both A and B eventually reach the same temperature.
II. Gravity stops heat from moving up into A.
III. Heat flows from A to B.
A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III
Correct Answer: A
The correct answer is (A). Gravity has nothing to do with heat transfer. Both objects will reach the same temperature when they have reached equilibrium.