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rotary engine
(Encyclopedia)rotary engine, internal-combustion engine whose cycle is similar to that of a piston engine, but which produces rotary motion directly without any conversion from reciprocating motion. A major problem...Goldwyn, Samuel
(Encyclopedia)Goldwyn, Samuel gōlˈdwĭn [key], 1882–1974, American film producer, b. Warsaw, Poland. Goldwyn arrived in the United States in 1896, and with Jesse L. Lasky and Cecil B. De Mille he organized the ...Barnard's star
(Encyclopedia)Barnard's star, star with the largest observed proper motion (rate of motion across the sky with respect to other stars); located in the constellation Ophiuchus. The star's large proper motion, 10.28...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...Mayer, Louis Burt
(Encyclopedia)Mayer, Louis Burt, 1885–1957, American movie producer, b. Russia. Mayer began (1907) as the operator of a theater in Haverhill, Mass., gradually gaining control of all the theaters in the city. In 1...fluid mechanics
(Encyclopedia)fluid mechanics, branch of mechanics dealing with the properties and behavior of fluids, i.e., liquids and gases. Because of their ability to flow, liquids and gases have many properties in common not...Ptolemaic system
(Encyclopedia)Ptolemaic system tŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with a...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...Gilbreth, Frank Bunker
(Encyclopedia)Gilbreth, Frank Bunker, 1868–1924, b. Fairfield, Me., and his wife, Lillian Moller Gilbreth, 1878–1972, b. Oakland, Calif., pioneering American industrial engineers. He was a largely self-taught e...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...Browse by Subject
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