A light metal panel is welded to two short sleeves of l-in. inside diameter that can slide

Question:

A light metal panel is welded to two short sleeves of l-in. inside diameter that can slide on a horizontal rod. The coefficients of friction between the sleeves and the rod are μs = 0.40 and μk = 0.30. A cord attached to corner C is used to move the panel along the rod. Knowing that the cord lies in the same vertical plane as the panel, determine the range of values of θ for which the panel will be in impending motion to the right.