In: Physics
4.20 A designer is trying to decide whether to use a circular or square single cell bar to carry a torsion load. The wall thickness must be the same for both designs. The weight must be the same regardless of the choice.
Based on the thin-wall theory, which is the better choice?
r = radius of circular cross-section
2w = width of square cross-section
Use thin-wall approximations for the cross-sectional areas.