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Chapter 3: Problem 113

A proposed ocean salvage scheme involves pumping air into "bags" placed within and around a wrecked vessel on the sea bottom. Comment on the practicality of this plan, supporting your conclusions with analyses.

Short Answer

Expert verified
The buoyancy principle suggests that using air bags inside and around a wrecked vessel could theoretically create a large enough buoyant force to lift the ship. However, practical considerations related to pressure differences, the strength of the bags and unpredictable marine conditions could make the execution of this plan quite challenging.

Step by step solution

01

Understanding buoyancy

Let's begin talking about buoyancy. An object submerged in fluid feels an upward force called the buoyant force. According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the object. So, if you place air bags around and inside a wrecked vessel, you increase the volume of water displaced without significantly increasing the weight of the system. This would, in theory, create a buoyant force strong enough to lift the ship.
02

Considering pressure

Pressure in a fluid increases with depth. This means the bottom of the wrecked vessel will be under a higher pressure than the top. When you start filling the bags with air, the pressure on the inside of the bags will have to be at least equal to the pressure outside to prevent them from being crushed. However, as you pump more air and increase the volume of the bags, the overall buoyant force of the system increases.
03

Evaluating practicality

While the idea seems feasible from a physics standpoint, practical considerations could make it challenging. If the wreck is at a large depth, the pressure differences could be significant. The air bags would need to be extremely strong to withstand the pressure. Plus, it could be difficult to control the bags' size while maintaining enough pressure inside them. Lastly, factors like debris and sea conditions could also affect the plan.

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