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  2. Impulse (physics) - Wikipedia

    en.wikipedia.org/wiki/Impulse_(physics)

    v. t. e. In classical mechanics, impulse (symbolized by J or Imp) is the change in momentum of an object. If the initial momentum of an object is p1, and a subsequent momentum is p2, the object has received an impulse J : Momentum is a vector quantity, so impulse is also a vector quantity. Newton’s second law of motion states that the rate of ...

  3. Y-Δ transform - Wikipedia

    en.wikipedia.org/wiki/Y-Δ_transform

    Y-Δ transform. In electrical engineering, the Y-Δ transform, also written wye-delta and also known by many other names, is a mathematical technique to simplify the analysis of an electrical network. The name derives from the shapes of the circuit diagrams, which look respectively like the letter Y and the Greek capital letter Δ.

  4. Okavango Delta - Wikipedia

    en.wikipedia.org/wiki/Okavango_Delta

    Satellite image of Okavango Delta, with national borders added Typical region in the Okavango Delta, with free canals and lakes, swamps and islandsThe Okavango Delta (or Okavango Grassland; formerly spelled "Okovango" or "Okovanggo") in Botswana is a vast inland delta formed where the Okavango River reaches a tectonic trough at an altitude of 930–1,000 m in the central part of the endorheic ...

  5. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The equals sign ( British English) or equal sign ( American English ), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation, it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the ...

  6. Glossary of graph theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_graph_theory

    1. A book, book graph, or triangular book is a complete tripartite graph K1,1,n; a collection of n triangles joined at a shared edge. 2. Another type of graph, also called a book, or a quadrilateral book, is a collection of 4 -cycles joined at a shared edge; the Cartesian product of a star with an edge. 3.

  7. Delta Electronics - Wikipedia

    en.wikipedia.org/wiki/Delta_Electronics

    Delta Electronics, Inc. (also known as DELTA or Delta Electronics) is a Taiwanese electronics manufacturing company. Its headquarters are in Neihu, Taipei. It is known for its DC industrial and computer fans and for switching power supplies. The company operates approximately 200 facilities worldwide, including manufacturing, sales, and R&D ...

  8. Del - Wikipedia

    en.wikipedia.org/wiki/Del

    Del. Del, or nabla, is an operator used in mathematics (particularly in vector calculus) as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes the standard derivative of the function as defined in calculus. When applied to a field (a function ...

  9. Delta Air Lines Flight 1141 - Wikipedia

    en.wikipedia.org/wiki/Delta_Air_Lines_Flight_1141

    Delta Air Lines Flight 1141 was a scheduled domestic passenger flight between Dallas/Fort Worth, Texas and Salt Lake City, Utah. On August 31, 1988, the flight, using a Boeing 727-200 series aircraft, crashed during takeoff, resulting in 14 deaths and 76 injuries of the 108 on board.

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