The two members shown are all pinned jointed made of wood having square cross sections of dimensions a x a. Determine the smallest value of a that will provide a factor of safety of 2.5 against buckling. Use E=12GPA for wood and assume the joint B is braced so that it can only move in the plane of structure.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.