1. The problem statement, all variables and given/known data http://img150.imageshack.us/img150/756/17311663go9.jpg [Broken] 3. The attempt at a solution I wasn't 100% sure whether this should be here or in the Engineering section, hopefully I've got it right. Anyway, I'm fairly unfamiliar with this type of problem and basically I'm just looking for an equation that will relate the permissible load to the tension and compression (part a) and an equation relating this permissible load to shear stress (part b). I've had a look through my notes and found nothing thus far. Thanks to anyone who can help!