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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...Croatoan
(Encyclopedia)Croatoan, unexplained letters found (1590) carved on a tree on Roanoke Island off North Carolina by Gov. John White when he returned to the colony from England and discovered the colonists gone. White...Juneau, Solomon Laurent
(Encyclopedia)Juneau, Solomon Laurent jo͞onōˈ, jo͞oˈnō [key], 1793–1856, French Canadian fur trader and founder of Milwaukee, Wis., b. near Montreal. In 1818, as an agent of the American Fur Company, he mov...relativity
(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...Degas, Edgar
(Encyclopedia)Degas, Edgar (Hilaire Germain Edgar Degas) ēlĕrˈ zhĕrmăNˈ ĕdgärˈ dəgäˈ [key], 1834–1917, French painter and sculptor, b. Paris; son of a banker. Although prepared for the law, he abandon...Mitchel, John
(Encyclopedia)Mitchel, John, 1815–75, Irish revolutionist and journalist. A practicing lawyer, Mitchel contributed articles to the Nation (Dublin) and the United Irishman, which he founded in 1848, calling for re...record player
(Encyclopedia)record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record (see sound reco...Penn, Irving
(Encyclopedia)Penn, Irving, 1917–2009, American photographer, elder brother of Arthur Penn, b. Plainfield, N.J.; studied Philadelphia Museum School of Industrial Art (now University of the Arts, 1934–38). Origi...Parmenides
(Encyclopedia)Parmenides pärmĕnˈĭdēz [key], b. c.515 b.c., Greek philosopher of Elea, leading figure of the Eleatic school. Parmenides' great contribution to philosophy was the method of reasoned proof for ass...simple harmonic motion
(Encyclopedia)simple harmonic motion: see harmonic motion. ...Browse by Subject
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