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D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...

Alcalá Zamora, Niceto

(Encyclopedia)Alcalá Zamora, Niceto nēthāˈtō älkäläˈ thämōˈrä [key], 1877–1949, Spanish statesman and president of Spain (1931–36). After holding several cabinet posts under the monarchy, he became...

hydraulics

(Encyclopedia)hydraulics, branch of engineering concerned mainly with moving liquids. The term is applied commonly to the study of the mechanical properties of water, other liquids, and even gases when the effects ...

Hillingdon

(Encyclopedia)Hillingdon, outer borough of Greater London, SE England. Industries include printing, motion-picture production, and the manufacture of aircraft, food p...

Achilles' tendon

(Encyclopedia)Achilles' tendon (tendo calcaneus) tĕnˈdō kălkāˈnēəs [key], sinew prominent at the back of the ankle, connecting the tendons of the calf muscles to the heelbone. When the musculature contracts...

Ashgabat

(Encyclopedia)Ashgabat əshkhəbätˈ [key], formerly Ashkhabad, city (2020 pop. 846,000), capital of Turkmenistan, near the border with Iran, on the Trans-Caspian RR. The city has text...

Arnoldson, Klas Pontus

(Encyclopedia)Arnoldson, Klas Pontus kläs pônˈtəs ärˈnôldsōn [key], 1844–1916, Swedish journalist and peace advocate. His untiring efforts for peace were rewarded by the 1908 Nobel Peace Prize, which he s...

Beverly Hills

(Encyclopedia)Beverly Hills, city (2020 pop. 32,701), Los Angeles co., S Calif., completely surrounded by the city of Los Angeles; inc. 1914. The largely residential ...

Neptune, in astronomy

(Encyclopedia)Neptune, in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolut...

binary star

(Encyclopedia)CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held together by the...