Question: Determine the angles ? for equilibrium of the 4-lb disk using the principle of virtual work. Neglect the weight of the rod. The spring is

Determine the angles ? for equilibrium of the 4-lb disk using the principle of virtual work. Neglect the weight of the rod. The spring is unstretched when ? = 0^o and always remains in the vertical position due to the roller guide.

1 ft - 3 ft k = 50 lb/ft

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