Question

During compression of a spring the work done is $10\,kJ$ and $2\,kJ$ escaped to the surroundings as heat. The change in internal energy, $\Delta\, U(in\,kJ)$ is:

• A. 8
• B. 12
• C. -12
• D. -8

Answer 1

Answer: (A)

8

Answer 2

$\Delta U = q + w$ $q = - 2\,kJ, W = 10\,kJ$ $\Delta U = 8\,kJ$