Final answer:
The percentage of an iron anchor's weight that will be supported by buoyant force when submerged in salt water cannot be determined precisely without additional information. The concept in question is based on Archimedes' principle in physics, which relates to the buoyant force and the displaced fluid's weight.
Step-by-step explanation:
The question regarding the percentage of an iron anchor's weight supported by buoyant force when submerged in salt water is related to the principles of physics, specifically, Archimedes' principle. This principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that the object displaces. To determine the percentage of weight supported by buoyant force, we can compare the weight of the displaced saltwater with the weight of the anchor. Saltwater has a higher density than freshwater, which means the buoyant force will be greater in saltwater.
However, without specific values for the density of saltwater and the anchor's volume, we cannot provide a specific percentage or fraction. Typically, the full weight of the anchor (100%) would not be supported by the buoyant force, as iron is denser than water. Therefore, the anchor will sink, but a certain fraction of its weight will be offset by the buoyant force, making it seem lighter underwater.
The other statements provided are not directly relevant to determining this fraction and seem to pertain to other questions regarding periodic inspections of life preservers and probability in battery life span, which are separate concepts.