Question: As you blow up a balloon, what are the interactions and the sign (positive: 1; negative: -1; none: 0) of (a) Q (b) Wext, if

As you blow up a balloon, what are the interactions and the sign (positive: 1; negative: -1; none: 0) of
(a) Q
(b) Wext, if any, between the balloon as a system and its surroundings?

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