$6-113.$ The board is used as a simply supported floor joist. If a bending moment of $M=800lb*ft$ is applied $3$ from the $z$ axis, determine the stress developed in the board at the corner $A.$ Compare this stress with that developed by the same moment applied along the $z$ axis $)=(0.$ What is the angle $$ for the neutral axis when $=3?$ Comment: Normally, floor boards would be nailed to the top of the beams so that $$~~$0$ and the high stress due to misalignment would not occur.