As shown in figure, a homogeneous 50-kg rigid block is suspended by the three springs whose lower ends were originally at the same level. Each steel spring has 24 turns of 10-mm-diameter on a mean diameter of 100 mm, and G = 83 GPa. The bronze spring has 48 turns of 20-mm-diameter wire on a mean diameter of 150 mm, and G=42 GPa. Compute the maximum shearing stress in each spring using approximate equation.

Rods AB and BC have diameters of 2.9 mm and 4.6 mm, respectively. A force F = 2.4 kN is applied to the ring at B, as shown. (Figure 1) Determine the angle so that the average normal stress in each rod is equivalent. Express your answer to three significant figures. What is this stress? Express your answer to three significant figures and include appropriate units.