2006-12-20 09:26:53 · 7 answers · asked by khushi s 1 in Science & Mathematics ➔ Physics
Both items displace a volume of water. However the ship is displacing a volume of water equal to its weight with a significant portion of the ship still above water. (reserve buoyancy) The volume of the needle is displacing water as well but the weight of this volume is less than the weight of the needle. The needle is totally submerged with zero reserve buoyancy. The heavier weight of the needle overcomes the buoyancy force of the displaced water so it sinks.
2006-12-20 09:35:48 · answer #1 · answered by MarkG 7 · 0⤊ 1⤋
The answer is bouyancy, but not exactly as the person above described.
The needle is more dense than water, so it sinks. It has a negative buoyancy because the water it displaces weighs less than it does.
The ship is less dense than water because it is mostly air; air is less dense than water. When it is floating, it has neutral buoyancy, so it neither sinks nor rises. The water displaced weighs exactly the same as the ship. This works because the ship weighs very little compared to its large size (most of its volume is air).
2006-12-20 17:32:15 · answer #2 · answered by computerguy103 6 · 1⤊ 1⤋
Needle weighs more than the water it displaces. Ship weighs less than the water it displaces.
A needle will float in mercury.
2006-12-20 21:49:08 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The buoyancy force is equal to the volume of water displaced times the density of water times the acceleration due to gravity. the force is upward and is really simply the weight of water displaced. the ship displaces more than its weight in water, the needle does not.
2006-12-20 17:31:38 · answer #4 · answered by nckobra40 3 · 0⤊ 0⤋
nckobra40 said it. the ship displaces more water so it has a larger bouyant force.
steve is also quite correct
2006-12-20 17:33:09 · answer #5 · answered by me 2 · 0⤊ 0⤋
a needle dose not displace water
2006-12-20 17:38:03 · answer #6 · answered by heap 1 · 0⤊ 2⤋
bouency
needle has no surface area so it sinks
boats have large surface area and the water will keep it afloat cause of bouency
2006-12-20 17:29:20 · answer #7 · answered by Anonymous · 0⤊ 0⤋