speed

distance travelled per unit time a rate (usually rapid) at which something happens

"the project advanced with gratifying speed" changing location rapidly the ratio of the focal length to the diameter of a (camera) lens system a central nervous system stimulant that increases energy and decreases appetite

used to treat narcolepsy and some forms of depression move fast

"He rushed down the hall to receive his guests"

"The cars raced down the street" move faster

"The car accelerated" move very fast

"The runner zipped past us at breakneck speed" travel at an excessive or illegal velocity

"I got a ticket for speeding" cause to move faster

"He accelerated the car"

For alternate uses, see special education or speed (disambiguation).''Speed (symbol: ''v'') is the rate of motion, or equivalently the rate of change of position, expressed as distance ''d'' moved per unit of time ''t''.Speed is a scalar quantity with dimensions lengthdistance/time; the equivalent vector (spatial)vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.Units of speed include:

metres per second, (symbol m/s), the SI derived unit

kilometres per hour, (symbol km/h)

miles per hour, (symbol mph)

knot (nautical)knots (nautical miles per hour, symbol kt)

Mach numberMach, where Mach 1 is the speed of sound; Mach ''n'' is ''n'' times as fast.::Mach 1 = ~343 m/s = ~1235 km/h = ~768 mi/h (see the speed of sound for more detail)

speed of light in vacuum (symbol ''c'') is one of the natural units:c'' = 299,792,458 m/s

other - important conversions::1 m/s = 3.6 km/h::1 mph = 1.609 km/h::1 knot = 1.852 km/h = 0.514 m/s Vehicles often have a speedometer to measure the speed.The rate of change of speed with respect to time is termed acceleration.

Average speed - Speed as a physical property represents primarily instantaneous speed. In real life we often use ''average speed'' (denoted $\backslash tilde$), which is rate of total distance (or length) and time interval.For example, if you go 60 miles in 2 hours, your ''average'' speed during that time is 60/2 = 30 miles per hour, but your instantaneous speed may have varied.In mathematical notation::$\backslash tilde\; =\; \backslash frac\; .$Instantaneous speed defined as a function of time on interval $t\_0,-\; t\_1$ gives average speed:
:$\backslash tilde\; =\; \backslash frac\; ^\; v(t)\; \backslash ,\; dt\}$while instant speed defined as a function of distance (or length) on interval $l\_0,-\; l\_1$ gives average speed:
:$\backslash tilde\; =\; \backslash frac\; ^\; \backslash frac\; \backslash ,\; dl\}$It is often intuitively expected that going half a distance with speed $v\_$ and second half with speed $v\_$, produce total average speed $\backslash tilde\; =\; \backslash frac$. The correct value is $\backslash tilde\; =\; \backslash frac\; +\; \backslash frac\; \}$
(Note that the first is arithmetic mean while the second is harmonic mean).
Average speed can be derived also from speed !Probability_density_functiondistribution function (either in time or on distance)::$v\; \backslash sim\; D\_t\backslash ;\; \backslash Rightarrow\; \backslash ;\; \backslash tilde\; =\; \backslash int\; v\; D\_t(v)\; \backslash ,\; dv$:$v\; \backslash sim\; D\_l\backslash ;\; \backslash Rightarrow\; \backslash ;\; \backslash tilde\; =\; \backslash frac\; \backslash ,\; dv\}$

Cultural significance - Speed or swiftness of motion plays a significant role in human culture, see racing. It is complementary to grace, precision and strength, e.g. in dancing or martial arts. Animals symbolizing speed are the horse (PIE ''*ek'vos'' is etymologically derived from ''*ok'u-'' "swift"), birds, especially raptors such as the hawk, and cats, e.g. the lynx (see e.g. Flos Duellatorum). The swiftest land animal is the cheetah, reaching running speeds of up to 110km/h.

See also -

Orders of magnitude (speed)

Paul Virilio

External links -

calc.skyrocket.de - Online Unit Converter - Conversion of many different unitsCategory:Units of velocity*Category:Physical !quantityde:Geschwindigkeites:V elocidadeo:Rapidofr:Vitesseko: 속력hr:Brzinaio:Rapidesohe:� �הירותnl:Snelheidja:速� �nb:Fartnn:fartpl:Szybkośćpt :Rapidezro:Vitezăru:Скор� �стьsimple:Speedsv:Fartzh:� ��率

Effective Reading Systems
Courses that improve reading speed,comprehension, and retention of difficult text and course materials. The basic course was originally designed for students entering an Executive MBA program, but it is suitable for all business and demanding reading applications. Also offered as WRIT 616 through Simon Fraser University's Writing and Publishing Program.
http://www.speedreader.net/

American Dog Derby
The American Dog Derby, a historic long distance dog sled race is held in Ashton, Idaho the third week of February.
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Muggees
Digital Solution providers
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arrest
Metalband from germany
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WatchNThings
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Complete Speed Training
Speed training system to help your athletes run faster by covering every aspect of training speed
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New Level Snowboarding
High end and high-tech Race, Speed and AllMountain Snowboards, created by Pro Rider, World Champion and WorldCup Winner Sigi Grabner from Austria. Two categories: Perfect soul riding boards for freecarving and freeriding and powerful ultimate race boards for winners. All SG boards are perfectly handcrafted in Austria. SG Snowboards - The long ones for the Strong ones!
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Official DEMOLITION website
Official website of Austrias Thrash Metal outfit DEMOLITION!
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Jackalope Creations
Machine Quilting Services. Quilting Services: Hazelbrook in the Blue Mountains, NSW Australia Jackalope Creations provides a full complement of machine quilting services from basic meandering to complex custom designs
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Chameleon Illustration
Illustration, desktop publishing, and web design. A one-stop shop for full corporate identity packages at reasonable rates. Specializing in medical, scientific and botanical illustration.
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Die Kunst der (manchmal schnellen) Verführung
Lernen Sie die perfekte MAsche von den besten Verführern aller Zeiten
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NEM offers a full line of Cappers and Cap Sorters for any application
New England Machinery bottle-packaging machine manufacturer. Our best selling products are Cappers, Conveyors, Lidders, Orienters, Unscramblers
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Watchesandthings.com
Largest Selection of Timex and Nike watches on the Internet! Also: Disney, Lorus, Barbie, and more! Free shipping on orders over $39.95, and free replacement battery on most watches!
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Metal Community - Svensk Metal Shop
Metalshop med massor av Stryper-prylar och annat skoj inom kristen metal.
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CineMandala DVD for Meditation and Stress Reductio
CineMandala DVD for meditation and stress reduction is an hour and 15 minutes of highly complex non-repeating computer generated kaleidoscopic visuals with an original soothing New Age ambient music soundtrack.
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Signal DIsplay Systems
Displays, Communications, Encryption, Electronics
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Koo Self Defense
Koo Self Defense is not a traditional martial art nor a mixture of different types of martial arts. Koo Self Defense has a different approach to training its students for health, fitness and street self defense! There are hundreds of different martial arts' styles in the world today. All of them are variations of each other except for Koo Self Defense which is not a style but was uniquely created from an out of the box approach which is from a street fighting viewpoint.
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Advanced Reading Concepts Speedreading Plus
Regularly scheduled speed reading courses and seminars for teens and adults in Columbus, Ohio and for groups nationwide. Techniques improve speed and comprehension on general and technical information. Excellent source to prepare for achievement tests while acquiring a life time skill.
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Ecolo Cycle - Electric bike
If you like biking but not always pedalling, this electric bike will be your best friend . With its 400 to 500 watts motor it allows you to extend your distance compared with a normal bike .
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Roller Skates, Ice Skates, Inline Skates visit NewSkates.com
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High Speed Internet for Australia
Best value high speed internet service in Australia.
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Elektronik - Homepage
Hier finden Sie ein Reichhaltiges und kostenloses Angebot im Bereich von elektronischen Schaltungen und Einführung zur Hobby - Elektronik, sowie an Downloads und Datenblätter für die Hobby - Elektronik u.v.m
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UK Broadband Guide
Compare the price, speed and service of UK broadband providers.
http://www.ukbroadbandguide.com/

Speedvision Online
Covering auto racing, automotive news, motorcycles, marine, and aviation news including TV schedules.
http://www.speedvision.com/

SpeedGuide.net
Extensive database of information providing both the novice and the technically advanced reader with better understanding, as well as tools for optimizing, troubleshooting and customizing their system.
http://www.speedguide.net

Speed Art Museum
Includes planning, museum, donation, collection, education, and membership information, calendar, links, FAQs, and program sponsors.
http://www.speedmuseum.org/