theory concerning Archimede's principle.
2006-10-19 00:22:04 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
If one places a copper ball in a pail of water it will sink, whereas a wooden ball will float. Whether or not a given object will sink or float in a fluid is determined by the buoyant force on the object. The buoyant force is essentially caused by the difference between the pressure at the top of the object, which pushes it downward, and the pressure at the bottom, which pushes it upward. Since the pressure at the bottom is always greater than at the top, every object submerged in a fluid necessarily feels an upward buoyant force. Of course, objects also feel a downward force due to gravity, and the difference between the gravitational force and buoyant force on a submerged object determines whether that object will sink, or rise to the surface. If the weight is greater than the buoyant force, the object sinks, and vice versa. It was Archimedes (supposedly while in his bath), who realized that submerged objects always displace fluid upwards (the level of water in the bathtub rose when Archimedes got in). Thus, he reasoned that the buoyant force on an object must be equal to the weight of fluid that object displaces. If the weight of an object is greater than the weight of displaced fluid, it will sink, wherease if the weight of the object is less than the weight of displaced fluid, it will rise. Moreover, it is evident that the volume of displaced fluid is precisely equal to the volume of the submerged part of the object, so that the difference between the buoyant force and the weight is determined by the relative density of the object and the fluid. In particular, we come to Archimide's principle, which implies that
2006-10-19 00:34:55 · answer #1 · answered by dandyl 7 · 3⤊ 0⤋
Archimedes' principle that states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. It is the reason that the overall size of ships is usually expressed in tons; the volume of the water displaced by the hull is equal in mass to the ship. Since water is very heavy (1 cubic metre weighs 1,000 kilograms) a very heavy ship can be supported reasonably easily.
2006-10-19 07:27:21 · answer #2 · answered by poorcocoboiboi 6 · 0⤊ 0⤋
The buoyant force acting on a body imered in fluid is equal to the weight of the fluid displaced - archemedes principle
2006-10-19 07:24:38 · answer #3 · answered by § mǎddy § 2 · 0⤊ 0⤋
Buoyancy force quantitatively is equal to the weight of the water(fluid) displaced by the immersed body!
2006-10-19 07:31:46 · answer #4 · answered by swanjarvi 7 · 0⤊ 0⤋