The following problems are to be solved using the principle of virtual work.
Problem
The bar AB in Problem 11.35 has mass m = 4 kg, length 2 m, and the spring constant is k = 12 N/m.
(a) Determine the value of a in the range 0<α<90° for which the bar is in equilibrium.
(b) Is the equilibrium position determined in part (a) stable?
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