Helium gas is enclosed in a gas-tight piston which is held in position by the clamping force of an elastic spring. In mechanical equilibrium, the gas pressure $p = -\frac FA$ corresponds to the tensioning force $F$ of the spring divided by the area $A$. The gas is then brought to a temperature of $T = 600 \,\text{K}$ by rapid heating from room temperature $T = 300 \,\text{K}$.

What is the final temperature of the gas (in units of Kelvin) after setting a new mechanical balance with the spring?

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**Details and Assumptions:**

- The volume of the gas is $V = Ax,$ where $A$ is the cross-sectional area and $x$ is the piston position.
- The mechanical force of the spring equals $F = - k x,$ where $k$ is the spring constant.
- The piston does not move during the heating from $300 \,\text{K}$ to $600 \,\text{K}$.
- Helium can be treated as an ideal gas.
- Energy is transferred only by mechanical work. The piston is perfectly thermally insulated.

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