why is easier for an object to be lifted in water than it is to be in air? please help?
110828
Archimedes said: When an object is submerged in water, there is a buoyant force upwards on it that is equivalent to the weight of the water displaced. \n\nSo if you have a heavy object underwater, and it is displacing water, its net weight will be less than when it is in air, displacing air, which is much lighter, so has a much smaller buoyant effect.
689832
The object must be less dense than the fluid to float, and more dense to sink.  If it is exactly equal density, then it can be suspended.
895549
suspension and floating
528305
To lift an object from a ground we must apply a force equal to the weight of the object and move it to the required height.\n\nThus to do a work two things are required, a force and a distance. \n\nWork is the product of these two. \n\nIf a body of weight 32N is to be moved up through a distance of 1m we have to do a work of 32 joule totally. \n\nThat is we apply a force of 32N and move it through 1m.\n\nThe same work can be done by a boy who cannot exert a force more than 16 N.\n\nThis is possible because, the boy has to move 16N force through a distance of 2m instead of usual 1m.\n\nWe can apply 1N force and move it through 32m. \n\nOnly thing is that the product of force and distance must be 32 joule.\n\nAll simple machines are based on this principle. \n\nWhen we reduce the force the distance is increased; when we increase the force the distance is reduced. But the product remains the same. That is the total work done is the same.
1163482
1 ) It is easy to roll and move from place as it is too heavy to lift.\n\n2 ) The main reason is that it wont enter the man hole. If it is aquare it will enter the man hole easily.
454463
There are many answers to your question. Gravity obviously. Another example is if you are try to lift a car with a lever or using a pulley to lift something.
1132679
Maybe it has something to do with the actions you're making.  When you're timing yourself out of water, you're just sitting there right?  But when your under water, you're treding or moving in some sort?  Try timing yourself when your walking around the house or jumping up and down....the blood takes in more oxygen(which means you need more) when its pumping faster.  Just an idea!
817654
Gravity...or if you mean why doesn't it come over the land...then that is because the land is higher then the sea, hence there is not enough water in the sea to raise it above the land.
494151
It's bernoulli's principle. Fluids have a lower pressure when moving than when still. Since the water is moving past the spoons (which act like the wing of a plane) they feel a pull from the pressure drop and come together. Try it with a peice of paper sometime. Roll a piec of paper up so when you place it on a flat surface it looks like a curved bridge. then blow under it and it will collapse instead of blow away. It's pretty neet.
80665
well as they said, the ball falls faster  than the feather, not becuase its heavier, not that gravity is more on it. its because of the simple reason, air risistence. in vacum, where there is no air , itll take the same time for both to reach ground.
39301
Think of it this way:  If an object weighs more than it would if it was made of water, it will sink.  If an object weighs less that it would if it was made of water it will float.\n\nA coin is made of solid metal which makes it denser than water, therefore heavier.  It will sink.  A ship is made of metal also, but NOT solid metal.  It also consists of other materials but mainly air (inside the ship).  This means it's lighter than water, which is why it will float.
783086
Gravity is pulling down on the object, air is resisting it (pushing up, if you will) and causing friction, and if there's any wind it's pushing sideways on the object. I doubt you'd have wind in your problem, though. Wind is complicated :)
870325
I suggest you build an anti-gravity lifter device that is able to float in the air without anything supporting it.\n\nhttp://www.amazing1.com/grav.htm
433818
Water provides more force than air because it is\ndenser and thus has more mass:\n\nF = ma \n\nd = m / volume
392567
the answer is a, mercury is much heavier than water and would require a heavier pressure tto reach the same altitude...i think..lol
1007361
The reason you floated better in the ocean is because the density of salt water is different than regular water. \n\nThink about keeping your hips high. If you're on your back, press the back of your neck/head to the bottom. If you're on your stomach, it's very natural for your legs to sink slightly. Just keep your hips up!
276362
in the unconstrained case (no floor), water from the lowest hole will reach the furtherest given enough time (vertical space to drop). With a vertical constraint (a floor), the optimal coverage will be from a hole one third the way up from the floor, not the top hole near the surface of the water, and not a hole at floor level.\n\nAlthough I really don't see how this applies to wind sailing:-)