The following problems are to be solved using the principle of virtual work.ProblemThe 1-k...

The following problems are to be solved using the principle of virtual work.

Problem

The 1-kg mass is suspended from the nonlinear spring described in Problem 11.28. The constants k = 10 and ε = 1, where x is in meters.

(a) Show that the mass is in equilibrium when x = 1.12m and when x = 2.45 m.

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(b) Determine whether the equilibrium positions are stable or unstable. (See Example 11.3.)