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

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

Problem

The bar AB described in Problem 11.37 has a mass of 2 kg, and the spring constant is k = 80 N/m.

(a) Determine the value of α in the range 0<α<90° for which the bar is in equilibrium.

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(b) Is the equilibrium position determined in (a) stable?