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centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

Barbirolli, Sir John

(Encyclopedia)Barbirolli, Sir John bärˌbərōˈlē [key], 1899–1970, English conductor and cellist, b. London. After being cellist (1920–24) in the International String Quartet, he organized the Barbirolli St...

electrocardiography

(Encyclopedia)electrocardiography ĭlĕkˌtrōkärdēŏgˈrəfē [key], science of recording and interpreting the electrical activity that precedes and is a measure of the action of heart muscles. Since 1887, when ...

harp

(Encyclopedia)CE5 Harp harp, stringed musical instrument of ancient origin, the strings of which are plucked with the fingers. Harps were found in paintings from the 13th cent. b.c. at Thebes. In different form...

superconductivity

(Encyclopedia)superconductivity, abnormally high electrical conductivity of certain substances. The phenomenon was discovered in 1911 by Heike Kamerlingh Onnes, who found that the resistance of mercury dropped sudd...

Tippett, Sir Michael

(Encyclopedia)Tippett, Sir Michael, 1905–98, English composer, b. London. Tippett studied at the Royal College of Music. During World War II he was briefly imprisoned as a conscientious objector. His strongly hel...

Crawford, Ruth

(Encyclopedia)Crawford, Ruth, 1901–53, American composer, b. East Liverpool, Ohio. Crawford attended music schools in Jacksonville, Fla., and Chicago. Her most frequently performed composition is a string quartet...

Haydn, Franz Joseph

(Encyclopedia)Haydn, Franz Joseph fränts yōˈzĕf hīˈdən [key], 1732–1809, Austrian composer, one of the greatest masters of classical music. As a boy he sang in the choir at St. Stephen's, Vienna, where he ...

Timotheus , Greek poet and musician

(Encyclopedia)Timotheus tĭmōˈthēəs [key], c.450–c.357 b.c., Greek poet and musician of Miletus. An innovator in music, he added a string to the kithara. Fragments of his dithyrambs and nomes remain. Euripide...

Lewis, rivers, United States and Canada

(Encyclopedia)Lewis. 1 Early name of the Snake River. 2 River, c.95 mi (155 km) long, rising in the Cascade Range, SW Wash., and flowing SW to the Columbia River NW of Vancouver. Three privately owned dams furnish ...