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Colorado Springs

(Encyclopedia)Colorado Springs, city (2020 pop. 478,961), seat of El Paso co., central Colo., on Monument and Fountain creeks, at the foot of Pikes Peak; inc. ...

Fort Bragg

(Encyclopedia)Fort Bragg, U.S. army base, 11,136 acres (4,507 hectares), E N.C., N of Fayetteville; est. 1918. Originally an artillery post, it is now the principal U.S. army airborne-training center and the site o...

electromotive force

(Encyclopedia)electromotive force, abbr. emf, difference in electric potential, or voltage, between the terminals of a source of electricity, e.g., a battery from which no current is being drawn. When current is dr...

fifth force

(Encyclopedia)fifth force, postulated fifth basic force of nature (the four known forces of nature are gravity, electromagnetism, and the strong and weak interactions). Proposed in 1986 to account for gravitational...

Force, Peter

(Encyclopedia)Force, Peter, 1790–1868, American journalist and historian, b. near Paterson, N.J. He served in the War of 1812 and afterward established himself in Washington, D.C., as a printer. Entering local po...

force bill

(Encyclopedia)force bill, popular name for several laws in U.S. history, notably the act of Mar. 2, 1833, and the Reconstruction acts of May 31, 1870; Feb. 28, 1871; and Apr. 20, 1871. The first force bill, passed ...

Moreno Valley

(Encyclopedia)Moreno Valley mərēˈnō [key], city (1990 pop. 118,779), Riverside co., S Calif., inc. 1984. In 1990, Moreno Valley was California's fastest-growing city, with a population increase of more than 300...

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...

Mojave Desert

(Encyclopedia)Mojave or Mohave Desert, c.15,000 sq mi (38,850 sq km), region of low, barren mountains and flat valleys, 2,000 to 5,000 ft (610–1,524 m) high, S Calif.; part of the Great Basin of the United States...

air pollution

(Encyclopedia)air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...