The air in the ship PLUS the weight of the ship must just equal
the weight of the water displaced (pushed out of the way)
by the hull of the ship.
The pin lacks the air.
Not at all. A small pebble and a giant boulder both sink, but a small feather and a giant battleship both float.
No. A toothpick and a tiny stone both have small mass, but one floats and the other sinks. A passenger ferry and a large boulder both have large mass, but one floats and the other sinks. It's not the mass that determines whether the object will float. It's the ratio of its mass to its volume ... the number known as the object's "density".
because a ship has big volume and a coin has small volume hence the smaller the area the bigger the pressure,the smaller the area the big the volume
Cut the pack in small pieces and then mix it water in a mixer grinder and then you need to hand pick the aluminum after drying.
Sure. A small stone can have the same weight as an inflated party balloon. But the balloon has more buoyancy, so it floats on water, while the stone sinks like a stone.
Anything which floats on water can only do so if it displaces, or moves out of the way, its own mass of water. Wood floats because it displaces a small amount of water, a large lump of iron is very heavy so it will keep displacing water until it has displaced its own mass.
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Dry paper is less dense than water and will float. But paper is absorbent: when in contact with water, it will start to absorb water into its fibers. This increases the density, so eventually it becomes saturated and sinks. Paper boats can be made, where only a small portion of the sheet is touching the water, slowing the absorption rate and allowing it to float much longer.
Small bathroom sinks can be made from a number of different materials these days. Some small sinks are porcelain, some are ceramic, and some could also be stainless steel. There are also small bathroom sinks that are made of china.
Edo floats are made by Kenmore Air Harbor of Seattle. For over 60 years they have been the most popular small aircraft floats.
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