Cross sections tell physicists how likely particles are to interact in a given way. Imagine two billiard balls rolling toward one another. The likelihood of a collision depends on easy-to-grasp ...

A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

The hypothesis used in developing the stress and strain in the shaft is that all points on a cross-section of the shaft experience the same angle of twist. The angle of twist for a section of length L ...