November 28, 2014

crazy speed wallpapers





Soooooooooogoy Wallpapers






crazy speed wallpapers




































Speed

In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.[1] The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval;[2] the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
Like velocity, speed has the dimensions of a length divided by a time; the SI unit of speed is the metre per second, but the most usual unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

November 27, 2014

Capitals and landmarks wallpapers

 

Soooooooooogoy Wallpapers

 

Capitals and landmarks wallpapers

 

 

 















































 

 

A landmark is a recognizable natural or man-made feature used for navigation, a feature that stands out from its near environment and is often visible from long distances.
In modern use, the term can also be applied to smaller structures or features, that have become local or national symbols.

Etymology

In old English the word landmearc (from land + mearc (mark)) was used to describe an "object set up to mark the boundaries of a kingdom, estate, etc.".[1] Starting from approx. 1560, this understanding of landmark was replaced by a more general one. A landmark became a "conspicuous object in a landscape". A landmark literally meant a geographic feature used by explorers and others to find their way back or through an area.[citation needed] For example the Table Mountain near Cape Town, South Africa, is used as the landmark to help sailors to navigate around southern tip of Africa during the Age of Exploration. Other than natural geographic feature, man-made structures are sometimes built to assist sailors in naval navigation. The Lighthouse of Alexandria and Colossus of Rhodes for example are ancient structures from antiquities built for this purpose, to lead ships to the port.
In modern usage, a landmark includes anything that is easily recognizable, such as a monument, building, or other structure. In American English it is the main term used to designate places that might be of interest to tourists due to notable physical features or historical significance. Landmarks in the British English sense are often used for casual navigation, such as giving directions. This is done in American English as well.[citation needed]
In urban studies as well as in geography, a landmark is furthermore defined as an external point of reference that helps orienting in a familiar or unfamiliar environment.[2] Landmarks are often used in verbal route instructions and as such an object of study by linguists as well as in other fields of study.[

Types of landmarks

Landmarks are usually classified as either natural landmarks or man-made landmarks, both are originally used to support navigation on finding directions. A variant is a seamark or daymark, a structure usually built intentionally to aid sailors navigating featureless coasts.
In modern sense, landmarks are usually referred to as monuments or distinctive buildings, used as the symbol of a certain area, city, or nation,
such as the Eiffel tower in Paris, Big Ben in London, Christ the Redeemer in Rio de Janeiro or Fernsehturm in Berlin. Church spires are often very tall and visible from many miles around, thus often serve as built landmarks. Also town hall towers and belfries often have a landmark character.
Natural landmarks can be characteristic features, such as mountains or plateaus. Trees also serve as local landmarks, such as jubilee oaks or conifers. Some landmark trees may be nicknamed, examples being Queen's Oak, Hanging Oak or Centennial Tree



A capital city or capital town (or simply capital) is the municipality enjoying primary status in a state, country, province, or other region, usually as its seat of government. A capital is typically a city that physically encompasses the offices and meeting places of its respective government; the status as capital is often designated by its law or constitution. In some jurisdictions, including several countries, the different branches of government are located in different settlements. In some cases, a distinction is made between the official (constitutional) capital and the seat of government, which is in another place.

Terminology

The word capital derives from the Latin caput, meaning "head".
In several English-speaking states, the terms county town, county seat, and borough seat are also used in lower subdivisions. In unitary states, subnational capitals are commonly known as "administrative centres".
An alternative term is headtown or political capital, but this phrase has a second meaning based on a different sense of the word capital. The capital is often, but not necessarily, the largest city of its constituent.