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Angelus, Byzantine emperors

(Encyclopedia)Angelus ănˈjələs [key], family name and dynasty of three Byzantine emperors (1185–1204): see Isaac II; Alexius III; Alexius IV. ...

mechanics

(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...

dyne

(Encyclopedia)dyne dīn [key], unit of force in the cgs system of units, which is based on the metric system; an acceleration of 1 centimeter per second per second is produced when a force of 1 dyne is exerted on a...

inertia

(Encyclopedia)inertia ĭnûrˈshə [key], in physics, the resistance of a body to any alteration in its state of motion, i.e., the resistance of a body at rest to being set in motion or of a body in motion to any c...

Maupertuis, Pierre Louis Moreau de

(Encyclopedia)Maupertuis, Pierre Louis Moreau de pyĕr lwē môrōˈ də mōpĕrtüēˈ [key], 1698–1759, French mathematician and astronomer. For his skillful support of Newton's theory he was admitted to the Ro...

Bulfinch, Thomas

(Encyclopedia)Bulfinch, Thomas, 1796–1867, American author, b. Newton, Mass., grad. Harvard, 1814. He wrote a series of works popularizing fable and legend, including The Age of Fables (1855), The Age of Chivalry...

Sara

(Encyclopedia)Sara or Sarah, in the Bible, wife of Abraham and mother of Isaac. With Rebecca, Rachel, and Leah, she was one of the four Hebrew matriarchs. Her name was originally Sarai [Heb.,=princess]. She was chi...

Kepler's laws

(Encyclopedia)CE5 Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F). Kepler's laws...

Alexius III

(Encyclopedia)Alexius III (Alexius Angelus) ănˈjələs [key], d. after 1210, Byzantine emperor (1195–1203). He acceded to power by deposing and blinding his brother Isaac II. This act served as pretext for the ...

Al-Fasi, Isaac ben Jacob ha-Kohen

(Encyclopedia)Al-Fasi, Isaac ben Jacob ha-Kohen äl-fäˈsē [key], 1013–1103, prominent Jewish Talmudic scholar of the very late Gaonic period, b. near Fès, N Africa. He headed the rabbinical school at Fès unt...