the force constant is equal to the restoring force operating
21Southern Africa — Introduction southernmost region of the African continent, comprising the countries of Angola, Botswana, Lesotho, Malawi, Mozambique, Namibia, South Africa, Swaziland, Zambia, and Zimbabwe. The island nation of Madagascar is excluded… …
22Steam engine — A steam engine is a heat engine that performs mechanical work using steam as its working fluid. [ [http://www.britannica.com/EBchecked/topic/564472/steam engine steam engine Britannica Online Encyclopedia ] ] Steam engines have a long history,… …
23Disneyland — This article is about the original park in Anaheim, California. For other uses, see Disneyland (disambiguation). Disneyland …
24Glossary of fuel cell terms — The Glossary of fuel cell terms lists the definitions of many terms used within the fuel cell industry. The terms in this glossary may be used by fuel cell industry associations, in education material and fuel cell codes and standards to name but …
25ARAB WORLD, 1945–2006 — The Arab world is divided into four subregions: the Maghreb (morocco , tunisia , algeria , libya , Mauritania), the Nile Valley (egypt and Sudan), the Fertile Crescent (syria , lebanon , iraq , jordan , and the palestinian authority ), and the… …
26Atlantic slave trade — The Atlantic slave trade, also known as the transatlantic slave trade, was the trade of African people supplied to the colonies of the New World that occurred in and around the Atlantic Ocean. It lasted from the 16th century to the 19th century.… …
27History of ancient Tunisia — The present day Republic of Tunisia, al Jumhuriyyah at Tunisiyyah , has over ten million citizens, almost all of Arab Berber descent. The Mediterranean Sea is to the north and east, Libya to the southeast, and Algeria to the west. Tunis is the… …
28United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
29china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material …
30China — /chuy neuh/, n. 1. People s Republic of, a country in E Asia. 1,221,591,778; 3,691,502 sq. mi. (9,560,990 sq. km). Cap.: Beijing. 2. Republic of. Also called Nationalist China. a republic consisting mainly of the island of Taiwan off the SE coast …
