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Multiple Choice Which of the following exchanges of energy has a positive sign for heat (relative to the system)?
A
snow melts on a mountaintop (snow is the system)
B
water vapor condenses on a cold surface (water vapor is the system)
C
a rock tumbles from a mountain (the rock is the system)
D
both the first and second choices
E
both the first and third choices
F
both the second and third choices
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