2007-01-23 01:41:03 · 7 answers · asked by norwood 1 in Science & Mathematics ➔ Physics
false
2007-01-23 01:44:02 · answer #1 · answered by Jabberwock 5 · 0⤊ 2⤋
Everything has some amount of buoyancy, even a solid piece of metal. As the object sinks deeper, the water that it displaces becomes increasingly dense and at some depth, the weight of the displaced water will equal the weight of the object (weight, not mass) and that object will float.
Weight is a measure of gravitational attraction between two bodies and is calculated by the inverse square of the distance between the two centers of gravity. Mass, on the other hand, is a constant (in a solid object), therefore does not change with distance.
Water, being compressible as it were, will necessarily have more molecules per unit volume at greater depth, therefore mass per unit volume will vary.
Anyway, an object at any depth will displace some water, therefore it will be 'lighter'.
2007-01-23 01:49:57 · answer #2 · answered by credo quia est absurdum 7 · 1⤊ 0⤋
Weight, a measure of force, is Mass x Acceleration. In air the mass is subject to only the acceleration caused by gravity. In water the mass will experience acceleration due to gravity just like in the air but it will also experience a buoyant force, even if it sinks, which is equal the the weight of the displaced water which is in the opposite direction of gravity.
This is why NASA trains astronauts under water for their space missions it causes to some degree a weightless environment.
So it is TRUE an object submerged in water will weight less than in air.
2007-01-23 05:26:03 · answer #3 · answered by Brian K² 6 · 0⤊ 0⤋
This is Archimedes Principle: -
When a body is partially or totally immersed in a liquid, its APPARENT loss in weight is equal to the weight of liquid displaced.
Note the term 'Apparent' - meaning it only SEEMS to lose weight.
As someone else noted, that "on the moon you weigh the same as on earth". Not true, your MASS is the same but your weight is 1/6th of that on earth.
2007-01-26 15:29:49 · answer #4 · answered by Norrie 7 · 0⤊ 0⤋
False, this is a trick question. It weighs the same in water as in air.
2007-01-23 01:45:34 · answer #5 · answered by Anonymous · 0⤊ 2⤋
false, it is because of the upward force the water somehow exerting
2007-01-23 01:46:58 · answer #6 · answered by pigley 4 · 0⤊ 2⤋
Weight doesn't change unless you go to another planet or the moon
2007-01-23 01:48:51 · answer #7 · answered by Anonymous · 0⤊ 2⤋