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Anonymous users2024-02-11Categories: Education Academic Exams >> Gaokao.
Problem description: An iron autumn in the air heavy all immersed in water for, ask to destroy the solid experience of this iron ball, or hollow lead? (Density = .)
Analysis: The buoyancy force of the iron ball in the water is, that is, the gravitational force of the water discharged by the iron ball is g Therefore, the volume of the water discharged by the iron ball is the volume of the iron ball.
v＝m/ρ=g/ρg=
The average density of the iron chaos dribble is:
m/v=g'vg=5*10 3kg m 3<, so it is hollow.
Good luck!
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Anonymous users2024-02-10Archimedes is one of the fundamental principles in mechanics. An object immersed in a liquid is subjected to an upward buoyant force equal to the weight of the liquid dislodged by the object.
An important principle of hydrostatics states that an object immersed in a stationary fluid is subjected to a buoyant force equal to the weight of the fluid discharged by the object, in a direction straight upwards and through the centroid of the fluid discharged. This conclusion was first put forward by Archimedes, so it is called Archimedes' principle. The conclusion is equally true for objects partially immersed in liquids.
The same conclusion can be generalized to gases.
The discovery of the law of Archimedes by the ancient Greek scholar has been widely used in all fields of human society, and its influence is huge.
According to the principle of buoyancy, the force exerted on an object submerged in a part or as a whole is equal to the weight of the liquid discharged by the volume of the object, which is of key significance for calculating the density of the object, and then carrying out the design and construction of submarines, ocean-going ships and ships, so people use Archimedes' law is relatively extensive.
Archimedes' law: The net force of an object immersed in a stationary fluid is equal to the gravitational force of the fluid dislodged by the object, in a vertical upward direction. The formula is f buoyancy = g to displace the fluid, and the formula can be further reduced to f buoyancy = p fluid xgxv to displace the fluid, and this law applies not only to liquids but also to gases.
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Anonymous users2024-02-09This sentence is the principle of leverage proposed by "Archimedes" in the book "On the Balance of Plane Figures"!
The picture shows the stone statue of Archimedes!
Archimedes (287 BC - 212 BC), the great ancient Greek philosopher, encyclopedic scientist, mathematician, physicist, mechanic, founder of static mechanics and hydrostatics, and enjoys the reputation of "the father of mechanics", Archimedes and Gauss, Newton are listed as the world's three major numerical orange scientists.
Archimedes once used the principle of levers to create a stone throwing machine called a stone crossbow, which could throw large stones at the warships of the Roman army, or use the transmitter to shoot spears and stones at the Roman soldiers. According to some later ancient texts, he built huge cranes that could lift enemy warships into the air and then fall heavily or spine down to smash them on the water.
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Anonymous users2024-02-08In 245 B.C., to celebrate the grand Moon Festival, King Henon gave a goldsmith a piece of gold to make a crown of pure gold. Although the crowns were as heavy as the previous gold, the king suspected the goldsmith of adulteration. He ordered Archimedes to determine whether the crown was pure gold, but not to destroy it.
This seems impossible. 、
While bathing in a public bath, Archimedes discovered the buoyancy force and proved that the buoyancy force is related to the displacement of the object (the volume of the object) and not to the weight of the object by experimenting with stones and wooden blocks. The perceived weight of an object in water must be related to the density of water (the mass per unit volume of water).
Here Archimedes found a solution to the king's problem, the key to which was density. If the crown contains other metals, its density will not be the same, and the volume of the crown will be different if the weight is the same. Putting the crown and the same weight of gold into the water found that the crown expelled a larger amount of water than the gold, suggesting that the crown was adulterated.
Archimedes was a great ancient Greek mathematician, physicist, engineer, inventor, and buried key astronomer who had many achievements in his career, with many famous theorems and inventions in mathematics and physics. But what happened to Archimedes has also become a topic of concern. >>>More
Archimedes determined the area of parabolic bows, spirals, circles, and the surface area and volume of various complex geometries such as ellipsoids and paraboloids. In the process of deriving these formulas, he created the "exhaustion method", which we today call a step-by-step approximation of the limit, and is therefore recognized as the originator of calculus calculations. He used the method of increasing the number of sides of the inner and outer polygons of the circle and gradually approaching the area, and found the pi more accurately. >>>More
These are not physical questions, but in the small case, they should be the psychology of the individual, and in the big case, they are philosophical questions. These laws are intertwined in an individual's life, affecting an individual's career, feelings, emotions, thoughts, psychology and other aspects, resulting in a variety of different results.
The law of watches and Sagai's law mean the same thing, and both refer to two different opinions on the same issue, leaving the executor at a loss.
The law of the watch says that the child should be given a prescribed time, and there should be a law on how to do it every day in life and work, so such a watch law will affect the child's living habits, affect the child's thinking, and affect the child's outlook on life and values.