to gain velocity
121sand dune — Hill, mound, or ridge of windblown sand or other loose material such as clay particles. Dunes are commonly associated with desert regions and seacoasts, and there are large areas of dunes in nonglacial parts of Antarctica. * * * Introduction any …
122Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …
123Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …
124Voyager program — This article is about the unmanned space probes of the 1970s. For other uses, see Voyager. The trajectories that enabled Voyager spacecraft to visit the outer planets and achieve velocity to escape our solar system The Voyager program is a U.S… …
125Ironclad warship — An ironclad was a steam propelled warship of the later 19th century, protected by iron or steel armor plates. [Hill, Richard. War at Sea in the Ironclad Age ISBN 0 304 35273 X; p.17] The ironclad was developed as a result of the vulnerability of… …
126Centrifugal compressor — Centrifugal compressors, sometimes termed radial compressors, are a sub class of dynamic axisymmetric work absorbing turbomachinery.[1] Centrifugal impeller with a highly polished surface likely to improve performance …
127.338 Lapua Magnum — Infobox Firearm Cartridge name=.338 Lapua Magnum caption= .338 Lapua Magnum cartridge case origin=flagcountry|Finland type= Rifle service= used by=Multiple official and civil users wars= Afghanistan War, Iraq War designer= Lapua design date=1989… …
128.223 WSSM — Infobox Firearm Cartridge name= .223 WSSM caption= .223 WSSM with 75 gr Hornady AMax bullet origin= USA type= Rifle service= used by= wars= designer= Browning, Winchester design date= 2002 manufacturer= Winchester production date= 2003 Present… …
