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Question: a) For the spring assemblages shown in Figure 1a, use the principle of minimum potential energy to determine the nodal displacements and the forces in each spring. 300 200 500 m 300 1000 N I 400 2 4 Figure la b) The nonlinear spring in Figure 1b has the force/deformation relationship f = k8². Express the total potential energy of the spring, and use this expression to plot the variation of the total potential energy with the change of displacement at the free end of the spring. From this graph, determine the minimum potential energy and the associated displacement that yields the stable equilibrium position. k - 1000 lb/in. 500 lb Figure 1b

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