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frictional head

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  • Hydraulic head — is a specific measurement of water pressure or total energy per unit weight above a geodetic datum. It is usually measured as a water surface elevation, expressed in units of length, but represents the energy at the entrance (or bottom) of a… …   Wikipedia

  • locomotion — /loh keuh moh sheuhn/, n. the act or power of moving from place to place. [1640 50; see LOCOMOTIVE, MOTION] * * * Any of various animal movements that result in progression from one place to another. Locomotion is classified as either… …   Universalium

  • ship — shipless, adj. shiplessly, adv. /ship/, n., v., shipped, shipping. n. 1. a vessel, esp. a large oceangoing one propelled by sails or engines. 2. Naut. a. a sailing vessel square rigged on all of three or more masts, having jibs, staysails, and a… …   Universalium

  • Unemployment — World unemployment rates[1] as of January 2009[update] Unemployment (or …   Wikipedia

  • Bicycle and motorcycle dynamics — A computer generated, simplified model of bike and rider demonstrating an uncontrolled right turn. An …   Wikipedia

  • History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… …   Wikipedia

  • Match — For other uses, see Match (disambiguation). An igniting match …   Wikipedia

  • match — match1 /mach/, n. 1. a slender piece of wood, cardboard, or other flammable material tipped with a chemical substance that produces fire when rubbed on a rough or chemically prepared surface. 2. a wick, cord, or the like, prepared to burn at an… …   Universalium

  • Moon — This article is about Earth s Moon. For moons in general, see Natural satellite. For other uses, see Moon (disambiguation) …   Wikipedia

  • Protection of exposed concrete — is necessary to prolong its service life. A 120 year design life for concrete infrastructure has become increasingly common. Without early preventive maintenance this design life target may be optimistic. The design service life of reinforced… …   Wikipedia

  • Labour economics — seeks to understand the functioning of the market and dynamics for labour. Labour markets function through the interaction of workers and employers. Labour economics looks at the suppliers of labour services (workers), the demanders of labour… …   Wikipedia

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