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letters
(Encyclopedia)letters, in literature, written messages, ranging from those addressed to the public and those sent from lover to lover, to business letters and thank-you notes. The common quality they share is a liv...work
(Encyclopedia)work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement. Although both fo...Blaine, James Gillespie
(Encyclopedia)Blaine, James Gillespie, 1830–93, American politician, b. West Brownsville, Pa. As Secretary of State, Blaine was particularly energetic in fostering closer relations with the Latin American natio...Penn, William, founder of Pennsylvania
(Encyclopedia)Penn, William, 1644–1718, English Quaker, founder of Pennsylvania, b. London, England; son of Sir William Penn. Penn became involved in the affairs of the American colonies when in 1675 he was ap...rat
(Encyclopedia)rat, name applied to various stout-bodied rodents, usually having a pointed muzzle, long slender tail, and dexterous forepaws. It refers particularly to the two species of house rat, Rattus norvegicus...Wilson, Harold
(Encyclopedia)Wilson, Harold (James Harold Wilson, Baron Wilson of Rievaulx), 1916–95, British statesman. A graduate of Oxford, he became an economics lecturer there (1937) and a fellow of University College (193...classicism
(Encyclopedia)classicism, a term that, when applied generally, means clearness, elegance, symmetry, and repose produced by attention to traditional forms. It is sometimes synonymous with excellence or artistic qual...force
(Encyclopedia)force, commonly, a “push” or “pull,” more properly defined in physics as a quantity that changes the motion, size, or shape of a body. Force is a vector quantity, having both magnitude and dir...hydraulic machine
(Encyclopedia)CE5 Hydraulic pressure: In any hydraulic device the pressure exerted by one piston is transmitted throughout the fluid. Since pressure equals force divided by area, a small force (F1) exerted on a ...heat
(Encyclopedia)heat, nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. The study of heat and its relationship ...Browse by Subject
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