Question: A hydrogen balloon rises up when released. Within a short period of time, the balloon expands and does a work of 6000 J to the

A hydrogen balloon rises up when released. Within a short period of time, the balloon expands and does a work of 6000 J to the outside environment. During the same period of time, it also loses 12000 J of heat. How much does the internal energy of the balloon changes?
(A) 6000 J
(B) - 6000 J
(C) 18000 J
(D) - 18000 J

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