How much force may be required to pull out a worker's buried foot?

The correct choice indicates that up to 750 pounds of force may be required to pull out a worker's buried foot. This significant amount of force reflects various factors, including the weight of the surrounding soil, the depth at which the foot is buried, and the physical properties of the earth, such as moisture content and compaction.

In situations where a worker may be trapped, typically in an excavation or similar environment, the natural pressure from the surrounding ground can create a substantial grip on a person's limb, making it challenging to extract. The necessary force to overcome this grip and free the worker is why the figure is quite high. Understanding this principle helps workers appreciate the hazards associated with working in excavated sites and underlines the importance of proper safety protocols, such as having a rescue plan in place and using adequate protective measures to prevent entrapment in the first place.

Less force is often insufficient for extracting a trapped foot, since it does not account for the combination of friction and pressure from multiple angles. Hence, the need for a figure as high as 750 pounds illustrates the risks and physical challenges that may be encountered in these scenarios.