the overall density goes up.
Because the overall density of a can is less than the density of water, a solid aluminium pole has a density greater than water
The density will rise and submerge the submarine.
The density will rise and submerge the submarine.
Its probably due to the overall density of the fruit. Should it be composed mostly of air (or more buoyant substances, like coconuts do), then its overall density would be lower than water, resulting in a fruit that floats on water.
I think you've shortened your question a bit too much for clarity. Why heavy ships are still able to float is often explained by saying that they are able to push away enough water to equal their own weight. It's all down to OVERALL density. Things that have a higher density than water sinks, and things that have a lower density than water floats. Now, water has no clue to the density of the material, it can only react to the overall density of the complete item. So if you take a heavy material, but turn it into a big, thin-walled container, the overall density of that container can still be less than that of water, and the contaienr will float.
Filling the ballast tanks with water increases the submarine's density. This will cause it to sink into the water. Blowing out the water with air reduces it and the sub will return to the surface.
The needle is solid, it's density higher than water's. The ship is hollow, its overall density lower than water's.
By altering the overall density of the ship by discharging the extra water they took on as ballast to make them sink
Increases
Saturn has a very low density overall, on average it is 0.7 g/cm3, less than the density of water. It is the least dense planet in our solar system.
Depends on several factors, including size of the flake, overall density and the density of the medium they are in. Typical cheaper gold flakes will float in water.