Solution
= Solution
On a timescale short compared with $\tau=\eta/E$, or for $\omega\tau\gg1$, the <dashpot> strongly resists rapid deformation. The imposed oscillating <stress> produces a small <strain>, of amplitude approximately $\sigma_0/(\eta\omega)$, nearly90degrees behind the <stress>. \b[The network appears stiff and predominantly viscous in this stress-controlled high-frequency limit.] It is not an ideal perfectly rigid body at finite frequency.