【正文】 39。quot。39。39。39。quot。quot。quot。quot。pi。quot。quot。quot。quot。quot。quot。39。quot。quot。quot。quot。quot。quot。39。39。 Concept, for the regular use of tools to create machinery in the Archimedes, the theory applied to the actual life is easy. Archimedes is likely to be the most thorough understanding of the principles and the use of machinery in the world at that time.
　　Archimedes and Athens scientists have a distinct difference, that is, he attaches importance to the rigor of science, accuracy, requirements for each question are accurate and logical proof。torqueamp。 and amp。lever principleamp。 Egypt has been up to two thousand years after the modern, and some people use this device. This tool became the ancestor of the later propeller.
　　Archimedes attaches great importance to the test, life design, manufacture a lot of equipment and machinery, it is worth mentioning that there are weight pulley, irrigation machine, water machine and military use of rubble and so on.
　　At the time of Europe, in the engineering and daily life, often use some simple machinery, such as: screws, tackles, levers, gears, etc., Archimedes spent a lot of time to study, found the amp。Archimedes spiral water extractor.amp。You even the earth are lifted up, put a boat into the sea should be no problem? Archimedes called craftsmen around the ship installed a set of Beautifully designed tackle and leverer. Archimedes called more than 100 people in front of the ship, grabbed a rope, he let the king affect a rope, the ship actually slowly slipped into the sea. King unusually happy, publicly announced: From now on, I ask everyone, whatever Archimedes say, trust him!
　　Mechanical application
　　Archimedes for mechanical research from his time in Alexandria school day, one day Archimedes in the long drought on the Nile side of the walk, see the farmers pouring water quite hard, after thinking he invented a The use of spiral in the water pipe in the rotation of the water to suck up the tools, later people call it amp。 resistance arm, with the formula can be expressed as: Haiwei Long Wang and encountered a difficult problem: the king for the Egyptian Ptolemy king made a ship, because too too heavy, the ship Can not put into the sea, the king said to Archimedes: amp。: to balance the lever, the two forces acting on the lever (the product of the force and arm) must be equal. That is: power ______。leverage balanceamp。.)
　　After a further experiment, he came to the palace, he put the crown and the same weight of pure gold on the two pots filled with water, pared the two pots of overflowing water, found to put the crown of the basin overflow Water is more than another pot. This shows that the crown of the volume of the same weight than the weight of pure gold, the density is not the same, so that the crown mixed with other metals.
　　The significance of this test is far greater than the detection of goldsmiths to deceive the king, Archimedes found buoyancy law (Archimedes principle): obje