Using a safety factor of five, determine the safe working load of a line with a breaking strain of 20,000 pounds.

Correct Answer: Option A — 4,000

Safe Working Load (SWL) is calculated by dividing the breaking strength by the designated factor of safety. For a line with a 20,000-pound breaking strain and a safety factor of five, the calculation is 20,000 divided by 5, resulting in an SWL of 4,000 pounds for safe operational use.