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, (kJ) is:

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,  (kJ) is:

Canvas Classes · Accepted Answer

Strategy:
 Apply the First Law of Thermodynamics (), ensuring respect for the IUPAC sign conventions: energy entering the system is positive, energy leaving is negative.

Step 1: Assign signs to inputs
- Work done on system (compression):  (system gains energy).
- Heat escaped to surroundings:  (system loses energy).

Step 2: Calculate

.
The internal energy of the spring increases by .

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