The document discusses various mechanical properties of materials including: 1) Ultimate strength is the maximum stress a material can withstand before fracturing. 2) Yield strength is the maximum stress before permanent deformation occurs. 3) Modulus of elasticity is the ratio of stress to strain in the linear region. It also discusses allowable stress which is determined using a factor of safety applied to the yield or ultimate strength to ensure stresses do not exceed yield strength and accounts for flaws. An example calculates the minimum cable diameter required to safely support a 200lb load from 300ft.