Wikimedia Bangladesh and Bengali Wikipedia by Zahid Aashaa
History of Wikipedia, Bengali Wikipedia and Wikimedia Bangladesh.
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Bhutanese Passport - Funny Audio Wikipedia
This is a Funny Audio Of Wikipedia Article Of Bhutanese passport. You Must listen to it.It Might Make Your Day And You Will Literally Roll on the Floor Laughing.
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Mike Portnoy - Wikipedia: Fact or Fiction?
If you #39;re new, Subscribe! http://bit.ly/subscribe-loudwire Legendary drummer Mike Portnoy sits down with Graham #39;Gruhamed #39; Hartmann for a round of #39;Wikipedia: Fact or Fiction? #39;. Go here...
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Mike Portnoy - Wikipedia: Fact or Fiction? - Video
Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. It embraces the study of the conditions under which fluids are at rest in stable equilibrium; and is contrasted with fluid dynamics, the study of fluids in motion. Hydrostatics are categorized as a part of the fluid statics, which is the study of all fluids, incompressible or not, at rest.
Hydrostatics is fundamental to hydraulics, the engineering of equipment for storing, transporting and using fluids. It is also relevant to geophysics and astrophysics (for example, in understanding plate tectonics and the anomalies of the Earth's gravitational field), to meteorology, to medicine (in the context of blood pressure), and many other fields.
Hydrostatics offers physical explanations for many phenomena of everyday life, such as why atmospheric pressure changes with altitude, why wood and oil float on water, and why the surface of water is always flat and horizontal whatever the shape of its container.
Some principles of hydrostatics have been known in an empirical and intuitive sense since antiquity, by the builders of boats, cisterns, aqueducts and fountains. Archimedes is credited with the discovery of the mathematical law that bears his name, that relates the buoyancy force to the volume and density of the displaced fluid. The Roman engineer Vitruvius warned readers about lead pipes bursting under hydrostatic pressure[1]
The concept of pressure and the way it is transmitted by fluids were formulated by the French mathematician and philosopher Blaise Pascal in 1647.
Due to the fundamental nature of fluids, a fluid cannot remain at rest under the presence of a shear stress. However, fluids can exert pressure normal to any contacting surface. If a point in the fluid is thought of as an infinitesimally small cube, then it follows from the principles of equilibrium that the pressure on every side of this unit of fluid must be equal. If this were not the case, the fluid would move in the direction of the resulting force. Thus, the pressure on a fluid at rest is isotropic; i.e., it acts with equal magnitude in all directions. This characteristic allows fluids to transmit force through the length of pipes or tubes; i.e., a force applied to a fluid in a pipe is transmitted, via the fluid, to the other end of the pipe. This principle was first formulated, in a slightly extended form, by Blaise Pascal, and is now called Pascal's law.
In a fluid at rest, all frictional stresses vanish and the state of stress of the system is called hydrostatic. When this condition of (V=0) is applied to the Navier-Stokes equation, the gradient of pressure becomes a function of body forces only. For a Barotropic fluid in a conservative force field like a gravitational force field, pressure exerted by a fluid at equilibrium becomes a function of force exerted by gravity.
The hydrostatic pressure can be determined from a control volume analysis of an infinitesimally small cube of fluid. Since pressure is defined as the force exerted on a test area (p = F/A, with p: pressure, F: force normal to area A, A: area), and the only force acting on any such small cube of fluid is the weight of the fluid column above it, hydrostatic pressure can be calculated according to the following formula:
where:
For water and other liquids, this integral can be simplified significantly for many practical applications, based on the following two assumptions: Since many liquids can be considered incompressible, a reasonably good estimation can be made from assuming a constant density throughout the liquid. (The same assumption cannot be made within a gaseous environment.) Also, since the height h of the fluid column between z and z0 is often reasonably small compared to the radius of the Earth, one can neglect the variation of g. Under these circumstances, the integral boils down to the simple formula:
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Hydrostatics - Wikipedia, the free encyclopedia
Get to knowWikipedia on "60 Minutes" this weekend.
Morley Safer and the CBS news magazine look at the online encyclopedia and the people behind it.
Founder Jimmy Wales acknowledges some errors but stresses that helping people is the priority for Wikipedia, which operates on donations.
"If we were ad supported, we would always be thinking these people reading about Elizabethan poetry. There's nothing to sell them, Wales says of the not-for-profit enterprise. "Let's try to get them to read about hotels in Las Vegas and we don't. We just don't care."
Wales tells "60 Minutes" he would rather do good than do well. "It just felt right that we should be a charity, free knowledge for everyone," he tells Safer. "That's always been our philosophy."
The report airs at 7 p.m. Sunday on WKMG-Channel 6.
Wikipedians explains their devotion to the information supplied.
"I do the editing because I love it. ... You have the satisfaction of feeling like you have participated in something," says Amanda Levandowski, a law school graduate. "You have the opportunity to help other people find information about stuff you're into."
The CBS news magazine highlights some astounding figures: 12,000 pages of Wikipedia are created each day. And 35 million articles are in 288 languages.
The news magazine visits a Wikimania conference in London, attended by more than 2,000. Safer also interviews Sue Gardner, the website's former No. 2 Wikipedian.
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Wikipedia opens up on '60 Minutes'