Archimedes
(mathematician) (c. 287-212 bc) Greek mathematician who made major discoveries in geometry, hydrostatics, and mechanics. He formulated a law of fluid displacement (Archimedes' principle), and is credited with the invention of the Archimedes screw, a cylindrical device for raising water.
Archimedes was born in Syracuse, Sicily. He designed engines of war for the defense of Syracuse, and was killed when the Romans seized the town.
It is alleged that Archimedes principle was discovered when he stepped into the public bath and saw the water overflow. He was so delighted that he rushed home naked, crying Eureka! Eureka! (i have found it! I have found it!) He used his discovery to prove that the goldsmith of the king of Syracuse had adulterated a gold crown with silver.
Archimedes' method of finding mathematical proof to substantiate experiment and observation would become the method of modern science in the High Renaissance. For example, the lever had been used by other scientists, but it was Archimedes who demonstrated mathematically that the ratio of the effort applied to the load raised is equal to the inverse ratio of the distances of the effort and load from the pivot, or fulcrum, of the lever.
Among Archimedes' inventions was a design for a model planetarium able to show the movement of the Sun, Moon, planets, and possibly constellations across the sky.
Archimedes wrote many mathematical treatises, some of which still exist in altered forms in Arabic translation. Among the areas he investigated were the value for p, which he approximated very closely. He also examined the expression of very large numbers, using a special notation. Archimedes also evolved methods to solve cubic equations and to determine square roots by approximation, as well as formulas for the determination of the surface areas and volumes of curved surfaces and solids.
Greek mathematician of the third century b.c.
Archilochus · archilute · archimandrite · Archimedes · arching · archipelagic · archipelago
Arhimed
IPA: / arximed /Starogrčki matematičar i fizičar, otkrio je potisak, silu koja deluje na svako telo zaronjeno u tečnosti ili gas.
Kada se Sirakuza pobunila protiv rimske vlasti, opsada je trajala dugo, a odbrani je mnogo pomogao slavni Arhimed, čiji su izumi ratnih strojeva zadavali napadaču mnogo problema. Ti strojevi su bili prava remek-dela i daleko su premašivali znanja svog vremena.
Najinteresantnije oružje velikog Arhimeda bile su tzv. zrake smrti. To su bila parabolična ogledala koja su, postavljena na zidove tvrđave usmeravale žarke sunčeve zrake na pojedine rimske brodove, gde su palile drvenu konstrukciju. Sve je to prisililo rimsku flotu da oprezno napada. Rimljani su ipak 212. godine pre nove ere zauzeli grad i zatekli Arhimeda zamišljenog nad krugovima nacrtanim na pesku i ubili ga.
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