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Vereshchagin, Vasily Vasilyevich

(Encyclopedia)Vereshchagin, Vasily Vasilyevich vəsēˈlyē vəsēlˈyəvĭch vyĕrĭshchäˈgĭn [key], 1842–1904, Russian painter, soldier, and traveler. He is best known for his military pictures, which portra...

viscosity

(Encyclopedia)viscosity, resistance of a fluid to flow. This resistance acts against the motion of any solid object through the fluid and also against motion of the fluid itself past stationary obstacles. Viscosity...

Copernican system

(Encyclopedia)Copernican system, first modern European theory of planetary motion that was heliocentric, i.e., that placed the sun motionless at the center of the solar system with all the planets, including the ea...

momentum

(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...

camera

(Encyclopedia)CE5 Image formed by a camera camera, lightproof box or container, usually fitted with a lens, which gathers incoming light and concentrates it so that it can be directed toward the film (in an opt...

speed

(Encyclopedia)speed, change in distance with respect to time. Speed is a scalar rather than a vector quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion. If...

stroboscope

(Encyclopedia)stroboscope strŏbˈəskōp [key], optical instrument for making a moving object appear to be slowed down or stationary. This effect is created by interrupting the observer's view so that the object i...

Sontag, Susan

(Encyclopedia)Sontag, Susan sŏnˈtäg [key], 1933–2004, American writer and critic, b. New York City. She grew up in Arizona and California, studied philosophy at the Univ. of Chicago, Harvard, and Oxford, absor...

Steinbeck, John

(Encyclopedia)Steinbeck, John, 1902–68, American writer, b. Salinas, Calif., studied at Stanford. He is probably best remembered for his strong sociological novel The Grapes of Wrath, considered one of the great ...

Rogovin, Milton

(Encyclopedia)Rogovin, Milton, 1909–2011, American documentary photographer, b. New York City, grad. Columbia (1931), Univ. of Buffalo (M.A., 1972). An optometrist and a political leftist, he moved (1938) to Buff...