concentrated moving load
71Northrop P-61 Black Widow — P 61 Black Widow A P 61A 1NO of 419th Night Fighter Squadron Role Night fighter …
72Pendulum — This article is about pendulums. For other uses, see Pendulum (disambiguation). Simple gravity pendulum model assumes no friction or air resistance …
73Battle of Passchendaele — For other uses, see Passchendaele (disambiguation). Battle of Passchendaele Third Battle of Ypres Part of the Western Front of the First World War …
74rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
75rocket and missile system — ▪ weapons system Introduction any of a variety of weapons systems that deliver explosive warheads to their targets by means of rocket propulsion. Rocket is a general term used broadly to describe a variety of jet propelled missiles… …
76THE EVENTS — introduction European Jewry in the Early 1930s Germany in the Early 1930s the expansion of the reich …
77Powered exoskeleton — The exhibit future soldier , designed by the US Army A powered exoskeleton, also known as powered armor, or exoframe, is a powered mobile machine consisting primarily of an exoskeleton like framework worn by a person and a power supply that… …
78Tea brick — Block tea redirects here. For the encryption algorithm, see Block TEA. A compressed brick of pu erh tea . Individual leaves can be seen on the surface of the brick. Tea bricks (traditional Chinese: 磚茶; simplified Chinese …
79Dam — This article is about structures for water impoundment. For other uses, see Dam (disambiguation). Hoover Dam, a concrete arch gravity dam in Black Canyon of the Colorado River. Lake Mead in the background is impounded by the dam …
80Smart grid — Public infrastructure …
