(Encyclopedia)
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Pulleys: The mechanical advantage (MA) of a system of pulleys is equal to the number of supporting strands: in A MA=1 and in B MA=2.
pulley, simple machine consisting of a…
(Encyclopedia) lots. The casting of lots was an ancient method of making a choice, settling a dispute, or determining a course of action. In biblical times lots were cast to determine the will of God…
(Encyclopedia) Cram, Donald James, 1919–2001, American chemist, b. Chester, Vt., Ph.D. Harvard, 1947. A professor at the Univ. of California at Los Angeles, Cram expanded on the work of Charles J.…
(Encyclopedia) solenoidsolenoidsōˈlənoidˌ [key], device made of a long wire that has been wound many times into a tightly packed coil; it has the shape of a long cylinder. If current is sent through…
(Encyclopedia) Quidor, JohnQuidor, Johnkĭdôrˈ [key], 1801–81, American painter, b. Tappan, N.Y., studied with J. W. Jarvis. Little appreciated in his own time, he was subsequently accorded a place…
(Encyclopedia) Willem-Alexander, 1967–, king of the Netherlands, eldest son of Queen Beatrix. He served (1985–87) in the navy and graduated (1993)from Leiden Univ.; he has been a member of the…
(Encyclopedia) Goring, George Goring, Baron, 1608–57, English royalist commander in the civil war. He was a court gallant who had previously served in the Dutch army. In 1641 a group of army officers…
(Encyclopedia) Guaidó, Juan (Juan Gerardo Guaidó Márquez), 1983–, Venezuelan political leader. An industrial engineer by training, he helped establish the Popular Will party in 2009 and was a protégé…
(Encyclopedia) parity or space parity, in physics, quantity that refers to the relationship between an object or process and the image that it can produce in a mirror. For example, any right-handed…
(Encyclopedia) meteor shower, increase in the number of meteors observed in a particular part of the sky. The trails of the meteors of a meteor shower all appear to be traceable back to a single…
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