In a closed insulator container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true?

△ U = w \neq O, q = O

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△ U = w = q \neq O

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△ U = O, w = q \neq O

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w = O, △ U = q \neq O

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Solution

The correct option is A $△ U = w \neq O, q = O$
A closed insulated container, a liquid is stirred with a paddle to increase the temperature, therefore it behave as adiabatic system, $q = 0$
$Δ U = q + w$
$⟹ Δ U = w \neq 0$

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