The disk B has a mass of 20 kg and is supported on the smooth cylindrical surface by a spr...

The disk B has a mass of 20 kg and is supported on the smooth cylindrical surface by a spring having a stiffness of k = 400 N/m and unstretched length of l0 = 1 m. The spring remains in the horizontal position since its end A is attached to the small roller guide which has negligible weight. Determine the angle θ for equilibrium of the roller.