Reply to Tourist submersible missing on visit to Titanic

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]My tween thinks that maybe someone wanted the billionaire dead. He has a point. How can they not know where they are when they have the exact coordinates of the wreck and of where they last were? The submersible sank like a stone in the ocean (literally) from a specific location. Obviously, it is on the ocean floor at or very near to that exact spot.[/quote]

No, he doesn’t have a point. Has he never heard of ocean currents? [/quote]

This thing weighs 12 tons and is not buoyant. It would take a pretty major current to displace it THAT much.[/quote]

The physics of how things fall in the air and in the water are different. In the air, weight mostly determines how fast something falls to the ground. You can have effects from wind resistance and the density of the air, but it’s negligible compared to what happens in the water.

In water, weight (mass x gravity) isn’t the sole determinant of whether it falls. Think about a ship that weighs 10 tons vs a bowling ball that weighs 12 lbs. Which will sink? The displaced water will push the object upward with a force equivalent to the weight of the water displaced.

Submarines are designed to be neutrally buoyant, which means their density (mass/volume) is the same as water. Water is not compressible, so the density of sea water is more or less constant depending on the makeup of the water. Depending on how much ballast was shed, the sub could be like a drop of water in the ocean if neutrally buoyant, going wherever the current goes.

These subs are designed to be neutrally buoyant in salt water. In water, you care more about the density of an object than just the weight. The [/quote]

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