see strength of materialsstrength of materials, measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by one part of an elastic body upon the adjoining part, and strain is the deformation or change in. ..... Click the link for more information.
The Koreans are believed to have originated from ancient China. This is gathered from the archaeological and linguist evidence.
Baek, also often spelled Paek, Baik or Paik, is of lord classed family name which can be traced as far as 8000 years between China and Korea Korean family name. No one really know the true origin in which it started either in China or Korea as both history timeline were similar.