Polymer mesh

I've got no idea where to start here, since f is not known...

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 Recognitions: Gold Member Homework Help Science Advisor I would think you'd want to relate the spring energy, $\frac{1}{2}k\langle x^2 \rangle$ (where $k$ is the stiffness), to the thermal energy, $k_B T$ (where $k_B$ is Boltzmann's constant).