What happens to the internal energy of a system if work is done on the system.

Explanation

To determine what happens to the internal energy of a system when work is done on it, we can apply the First Law of Thermodynamics, which states that energy is conserved. The relationship can be expressed as:

\[ \Delta U = \Delta Q + \Delta W \]

Where:
- \(\Delta U\) = change in internal energy of the system
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