A spring with a torsional stiffness k is attached to the hinge at B. It is unstretched when the rod assembly is in the vertical position. Determine the weight W of the block that results in neutral equilibrium. Establish the potential energy function for a small angle θ, i.e., approximate sin θ ≈ 0, and cos θ ≈ 1 - θ²/2.

Transcribed Image Text:

B C k