What kind of proof do i have when i make a statement that things experience a buoyant force from air?
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I go with C. \n\na) Chickens don't fly very well.\nb)Water is denser than air, and mercury is denser than water. It's true.\nd)But, if the cat is drunk it won't land on it's feet.
830855
What is to be proved? It's not clear.
901376
Buoyancy is alot like drag in air, its proportional to surface area. (As in, if you increase the surface area, the force required to overcome the "drag" of water increases).\n\n You have one of two situations: Your boat is stationary, in which case, a barge or square shaped vessel with pontoons balancing it, or a dynamic vessel, with pointed fore and aft sections, once more with pontoons.\n\n Pontoons are what are going to make or break your design, you can increase your potential surface area by adding pontoons on arms, jutting from the sides of your vessel, and reduce your boat's mass at the same time.
397031
Archimedes LAW of buoyancy states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body.. also, the density of the ship( and the air inside it) is lesser than the density of water. \n\nBernoulli's principle explains why airplanes fly: air/water traveling at faster speed has lower pressure in it.\nthe shape of the airplanes wing is like half of a water drop. therefore the air flowing at the top/above the wing of an airplane is faster compare to the air underneath creating enough pressure to lift the airplane.
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atmospheric pressure decreases as altitude increases.\n(think about gravity)\n\nan object that floats is less dense than the fluid it floats in.\n"A piece of the object weighs less than a piece of the fluid the same size."
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I assume you meant to say, "taken under" water.\n\nWeight is the force which is exerted by gravity on an object.  No matter where the object is, under the same gravitational field, the object's weight is the same.\n\nAbove water, under water, beside water, the Lead and the concrete will have the same weight...all else being constant.\n\nWhat you are refering to is the effects of boyancy upon the appearent weight of the object.\nIn air, the effects of boyancy are usually negligible, but underwater, they play more of a role.\n\nWhen something is under water, it displaces its volume of water and by doing so, the water exerts a force back onto the object equal to its own weight.  The boyant force (weight of the displaced water) depends on the volume of the object, not its mass (as opposed to an object's weight which depends on its mass and not volume).\nSince the lead is much more dense than the concrete, despite having an eqaul mass, it displacing less water and have a smaller boyancy force acting upward on it.  This lower boyancy force means that the Lead would "feel" heavier than the water when the total net downward force is measured.
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Even in close rooms there is air convection, that is, warm air moves naturally from the floor to the ceiling. You may not feel it (it's a tiny flow), but it's there. Don't be scared, it's a natural thing, no ghost is involved.
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IT MEANS THAT AIR HAD ENTERED IT
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1.  Air has weight.  You can prove it by filling a basketball to the proper pressure and weighing it on a sensitive scale.  Empty and flatten the ball and weigh it again.  Go ahead, do it.  I'll wait.  Either that or just take my word for it.\n\n2.  Assume that you agree, I have proven that air has weight.  If you weigh a stack of basketballs, they should weigh what one ball weighs time the number of  balls.  Lift up the entire stack of balls and you can see for yourself that the stack weighs more than one.\n\n3.  Step on a ladder and lift up only half of the balls.  The weight of the stack from that point up weighs less than the entire stack.  go to the top of the stack and pick up the top ball.  It should only weigh the same as one ball.   Air pressure works in a similar way.  The pressure, or weight of the air at sea level is much more than the pressure, or weight at the top of a mountain.  At sea level, you fell the weight of all that air on top of the stack,\n\n4.  Return all the basketballs.  The coach needs them.
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Use Archimedes's buoyancy principal.  The weight outside represents the response of mass to the Earth's gravity.  The weight in water represents the displaced water's weight.  Use the ratio to get the answer.  HINT: if you convert to mass, the answer almost gives itself away.\nThe displaced water has a well known density.  That density will give the volume of the both the displaced water and the object displacing it.
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actually, it can! If you understand physics, the website below has proof. (but I dont know how hard you threw it.)
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good one... like there is Tsunami...a low pressure area in water body.Why there is no air movement.\nThere may be a little movement which is not highly noticeable.
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Here's one: Measure the density of air.\n\nTake a flask, weigh it.\nVacuum out all the air, then weight it again.
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Archimedes principle on bouyancy states that a body submerged in a fluis is subjected by an unbalance force called bouyant force equal to the weight of the displaced fluid. By formula, Fb = Vd\n;Fb = bouyant force\nV = volume of te dispaced fluid\nd = density of the fluid\n\nDimensional Analysis,\nFb must had a unit of force; Kg, N, lb\nV is volume; cu.m, cu.ft\nd is density; kg/cu.m. and so on.\n\nFb(Kg) = V(cu.m.)*d(Kg/cu.m.)\n\nu'll get Kg.
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Hi,\n\nGalileo was faced by similar queries and this is his response:\n\nShut yourself up with some friend in the main cabin below decks on some large ship, and have with you there some flies, butterflies, and other small flying animals. Have a large bowl of water with some fish in it; hang up a bottle that empties drop by drop into a wide vessel beneath it. With the ship standing still, observe carefully how the little animals fly with equal speed to all sides of the cabin. The fish swim indifferently in all directions; the drops fall into the vessel beneath; and, in throwing something to your friend, you need throw it no more strongly in one direction than another, the distances being equal; jumping with your feet together, you pass equal spaces in every direction. When you have observed all these things carefully (though there is no doubt that when the ship is standing still everything must happen in this way), have the ship proceed with any speed you like, so long as the motion is uniform and not fluctuating this way and that. You will discover not the least change in all the effects named, nor could you tell from any of them whether the ship was moving or standing still. In jumping, you will pass on the floor the same spaces as before, nor will you make larger jumps toward the stern than toward the prow even though the ship is moving quite rapidly, despite the fact that during the time that you are in the air the floor under you will be going in a direction opposite to your jump. In throwing something to your companion, you will need no more force to get it to him whether he is in the direction of the bow or the stern, with yourself situated opposite. The droplets will fall as before into the vessel beneath without dropping toward the stern, although while the drops are in the air the ship runs many spans. The fish in their water will swim toward the front of their bowl with no more effort than toward the back, and will go with equal ease to bait placed anywhere around the edges of the bowl. Finally the butterflies and flies will continue their flights indifferently toward every side, nor will it ever happen that they are concentrated toward the stern, as if tired out from keeping up with the course of the ship, from which they will have been separated during long intervals by keeping themselves in the air. And if smoke is made by burning some incense, it will be seen going up in the form of a little cloud, remaining still and moving no more toward one side than the other. The cause of all these correspondences of effects is the fact that the ship's motion is common to all the things contained in it, and to the air also. That is why I said you should be below decks; for if this took place above in the open air, which would not follow the course of the ship, more or less noticeable differences would be seen in some of the effects noted.\n\nAlthough, this seems obvious to us now in its day it was quite startling. But it is the same for an Astronaut on a space walk. His craft appears stationary to him, although both he and it a traveling at great speed. So, we judge that something is moving only by its movement relative to us or some other object.\n\nThis, if you like, is Galilean relativity, we judge objects to be moving only if they are moving relative to our frame of reference.
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Hi, its not gravity but a force opposite to gravity that prevents a boat from sinking and keeps an airplane in the air. Sorry, but I forgot the name of the force, I think it begins with a B. O, the second person said it- Buoyancy.
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You must show not tell. Take a bowl filled to the top with water and put it on a plate to catch overflow. The put objects in the water and compare the overflow for sinking and floating objects of the same size. If you have a scale weigh the objects and the water if not just hold them and judge weight. Then explain density.