# Back to the Classics!

**Classical Mechanics**Level 4

Calculate the energy stored in the spring with spring constant \(\displaystyle 2K\).

**Details and Assumptions:**

\(\bullet\) The springs are initially relaxed.

\(\bullet\) The rods expand only in the horizontal direction.

\(\bullet\) Neglect the expansion of the springs due to the increase in temperature

\(\bullet\) \(\displaystyle L = 1m\)

\(\bullet\) \(\displaystyle K = 200 N/m\)

\(\bullet\) \(\displaystyle \alpha = 2\times 10^{-5} K^{-1}\)

\(\bullet\) \(\displaystyle \Delta T = 20^o C\)