Aerodynamics, from Greek ἀήρ aero (air) + δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics.The term aerodynamics is often used synonymously with gas dynamics, the difference being that "gas dynamics" applies to the study of the motion of all gases, and is not limited to air. The formal study of aerodynamics began in the modern sense in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag were recorded much earlier. Most of the early efforts in aerodynamics were directed toward achieving heavier-than-air flight, which was first demonstrated by Otto Lilienthal in 1891. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed a rational basis for the development of heavier-than-air flight and a number of other technologies. Recent work in aerodynamics has focused on issues related to compressible flow, turbulence, and boundary layers and has become increasingly computational in nature.
A drag queen is a person, usually male, who uses drag clothing and makeup to imitate and often exaggerate female gender signifiers and gender roles for entertainment purposes. In modern times, drag queens are associated with gay men and gay culture, but people of many genders and sexual identities perform as drag queens.
RuPaul Andre Charles, known mononymously as RuPaul, is an American drag queen, television judge, musician, and model. He is best known for producing, hosting, and judging the reality competition series RuPaul's Drag Race.
Drag kings are mostly female performance artists who dress in masculine drag and personify male gender stereotypes as part of an individual or group routine. A typical drag show may incorporate dancing, acting, stand-up comedy and singing, either live or lip-synching to pre-recorded tracks. Drag kings often perform as exaggeratedly macho male characters, portray marginalised masculinities such as construction workers and rappers or they will impersonate male celebrities like Elvis Presley, Michael Jackson and Tim McGraw.
In fluid dynamics, the drag coefficient is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water. It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag. The drag coefficient is always associated with a particular surface area.
Mae West was an American stage and film actress, playwright, screenwriter, singer, and sex symbol whose entertainment career spanned over seven decades. She was known for her breezy sexual independence, and her lighthearted bawdy double entendres, often delivered in a husky contralto voice. She was active in vaudeville and on stage in New York City before moving to Los Angeles to pursue a career in the film industry.
Google Hacks: Tips & Tools for Smarter Searching is a book of tips about Google by Tara Calishain and Rael Dornfest. It was listed in the New York Times top ten business paperbacks in May 2003, considered at the time to be "unprecedented" for a technology book, and "even rarer" for the topic of search engines. The book was first published by O'Reilly in February 2002. The third edition of the book was released in 2006.
Terminal velocity is the maximum velocity (speed) attainable by an object as it falls through a fluid. It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object. Since the net force on the object is zero, the object has zero acceleration.
In aerodynamics, lift-induced drag, induced drag, vortex drag, or sometimes drag due to lift, is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it. This drag force occurs in airplanes due to wings or a lifting body redirecting air to cause lift and also in cars with airfoil wings that redirect air to cause a downforce. It is symbolized as , and the lift-induced drag coefficient as .
System 7, codenamed "Big Bang", and also known as Mac OS 7, is a graphical user interface-based operating system for Macintosh computers and is part of the classic Mac OS series of operating systems. It was introduced on May 13, 1991, by Apple Computer, Inc. It succeeded System 6, and was the main Macintosh operating system until it was succeeded by Mac OS 8 in 1997. Features added with the System 7 release included virtual memory, personal file sharing, QuickTime, QuickDraw 3D, and an improved user interface.
The Merck Index is an encyclopedia of chemicals, drugs and biologicals with over 10,000 monograph on single substances or groups of related compounds published online by the Royal Society of Chemistry.
The International Standard Atmosphere (ISA) is a static atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere change over a wide range of altitudes or elevations. It has been established to provide a common reference for temperature and pressure and consists of tables of values at various altitudes, plus some formulas by which those values were derived. The International Organization for Standardization (ISO) publishes the ISA as an international standard, ISO 2533:1975. Other standards organizations, such as the International Civil Aviation Organization (ICAO) and the United States Government, publish extensions or subsets of the same atmospheric model under their own standards-making authority.
In music, portamento is a pitch sliding from one note to another. The term originated from the Italian expression "portamento della voce", denoting from the beginning of the 17th century its use in vocal performances and emulation by members of the violin family and certain wind instruments, and is sometimes used interchangeably with anticipation. It is also applied to one type of glissando on, e.g., slide trombones, as well as to the "glide" function of steel guitars and synthesizers; in the latter it is often used to add a melancholic effect to the overall melody.
Look What the Cat Dragged In is the debut studio album by American glam metal band Poison, released on May 23, 1986 through Enigma Records. Though not a success at first, it steadily built momentum and peaked at #3 on the US Billboard 200 on May 23, 1987. The album spawned three successful singles: "Talk Dirty to Me", "I Want Action", and "I Won't Forget You".
In fluid dynamics, drag is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers or between a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, the drag force depends on velocity.
A pivot table is a table of grouped values that aggregates the individual items of a more extensive table within one or more discrete categories. This summary might include sums, averages, or other statistics, which the pivot table groups together using a chosen aggregation function applied to the grouped values.
A red herring is something that misleads or distracts from a relevant or important question. It may be either a logical fallacy or a literary device that leads readers or audiences toward a false conclusion. A red herring may be used intentionally, as in mystery fiction or as part of rhetorical strategies, or may be used in argumentation inadvertently.
Ian F Svenonius is an American musician and singer of various Washington, D.C.-based punk bands including Nation of Ulysses, the Make-Up, Weird War, XYZ, Escape-ism, and Chain and the Gang. Between his numerous projects, Svenonius has released more than 22 full-length albums and over 20 singles, EPs, and splits. A published author and online talk show host, Svenonius' projects share a tongue-in-cheek, radical left political ideology.
The drag coefficient is a common measure in automotive design as it pertains to aerodynamics. Drag is a force that acts parallel to and in the same direction as the airflow. The drag coefficient of an automobile measures the way the automobile passes through the surrounding air. When automobile companies design a new vehicle they take into consideration the automobile drag coefficient in addition to the other performance characteristics. Aerodynamic drag increases with the square of speed; therefore it becomes critically important at higher speeds. Reducing the drag coefficient in an automobile improves the performance of the vehicle as it pertains to speed and fuel efficiency. There are many different ways to reduce the drag of a vehicle. A common way to measure the drag of the vehicle is through the drag area.
The Drill Master diving accident was an incident in Norway in January 1974 that claimed the lives of two Ocean Systems commercial divers. During a two-man dive from the North Sea rig Drill Master, the diving bell's drop weight was accidentally released, causing the bell to surface from a depth of 320 feet (98 m) with its bottom door open and drag the diver working outside through the water on his umbilical. The two divers, Per Skipnes and Robert John Smyth, both died from rapid decompression and drowning. The accident was caused by instructions aboard Drill Master which had not been updated when the bell system was modified and which stated that a valve should be closed during the dive which should have been open.
