Question

In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true

• A. $\Delta E = W = Q = 0$
• B. $\Delta E \neq 0,Q = W = 0$
• C. $\Delta E = W \neq 0,Q = 0$
• D. $\Delta E = Q \neq 0,W = 0$

Answer 1

Answer: (C)

$\Delta E = W \neq 0,Q = 0$

Answer 2

As the system is closed and insulated no heat enter or leave the system, i.e. $q = 0$ ; $\therefore\Delta E = Q + W = W$