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In a closed insulated container, a liquid is stirred with a paddle to increase the temperature, which of the following is true?

1. ΔE = W, q = 0
2. ΔE = W + q = 0
3. ΔE = 0, W = q ≠ 0
4. W = 0, ΔE = q ≠ 0

Correct answer: ΔE = W, q = 0

Solution

In an insulated container, no heat exchange occurs (q = 0). The work done by stirring increases the internal energy (ΔE = W).

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