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  1. The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light (or simply light). The optical spectrum is sometimes considered to be the same as the visible spectrum, but some authors define the term more broadly, to include the ...

  2. Raymond Brownell (17 May 1894 – 12 April 1974) was a senior officer in the Royal Australian Air Force (RAAF) and a World War I flying ace. He enlisted in the Australian Imperial Force at the outbreak of World War I and served in the Gallipoli campaign before transferring to the Western Front. Awarded the Military Medal for his actions during ...

  3. The Tupolev Tu-22M (Russian: Туполев Ту-22М; NATO reporting name: Backfire) is a supersonic, variable-sweep wing, long-range strategic and maritime strike bomber developed by the Tupolev Design Bureau in the 1960s. The bomber was reported as being designated Tu-26 by Western intelligence at one time.[1] During the Cold War, the Tu ...

  4. Polytetrafluoroethylene is a fluorocarbon solid, as it is a high- molecular-weight polymer consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.

  5. en.wikipedia.org › wiki › Hooke's_lawHooke's law - Wikipedia

    In physics, Hooke's law is an empirical law which states that the force ( F) needed to extend or compress a spring by some distance ( x) scales linearly with respect to that distance—that is, Fs = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness ), and x is small compared to the total possible deformation of ...

  6. In vector calculus, the Jacobian matrix (/ dʒ ə ˈ k oʊ b i ə n /, / dʒ ɪ-, j ɪ-/) of a vector-valued function of several variables is the matrix of all its first-order partial derivatives.When this matrix is square, that is, when the function takes the same number of variables as input as the number of vector components of its output, its determinant is referred to as the Jacobian ...

  7. The scale was devised in 1805 by Francis Beaufort (later Rear Admiral ), a hydrographer and a Royal Navy officer, while serving on HMS Woolwich, and refined until he was Hydrographer of the Navy in the 1830s, when it was adopted officially. It was first used during the 1831-1836 "Darwin voyage" of HMS Beagle under Captain Robert FitzRoy, who ...

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