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  2. Carl Gustaf 8.4 cm recoilless rifle - Wikipedia

    en.wikipedia.org/wiki/Carl_Gustaf_8.4_cm...

    The Carl Gustaf 8.4 cm recoilless rifle (Swedish pronunciation: [kɑːɭ ˈɡɵ̂sːtav], named after Carl Gustafs Stads Gevärsfaktori, which initially produced it) is a Swedish-developed 84 mm (3.3 in) caliber shoulder-fired recoilless rifle, initially developed by the Royal Swedish Army Materiel Administration during the second half of the 1940s as a crew-served man-portable infantry ...

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    2 cm – approximate width of an adult human finger; 2.54 cm – 1 inch; 3.08568 cm – 1 attoparsec; 3.4 cm – length of a quail egg [112] 3.5 cm – width of film commonly used in motion pictures and still photography; 3.78 cm – amount of distance the Moon moves away from Earth each year [113] 4.3 cm – minimum diameter of a golf ball [114]

  4. Uniform tiling - Wikipedia

    en.wikipedia.org/wiki/Uniform_tiling

    (4 4/3 ∞), (3/2 3 ∞), (6 6/5 ∞), (3 3/2 ∞). Branko Grünbaum and G. C. Shephard , in the 1987 book Tilings and patterns , section 12.3, enumerate a list of 25 uniform tilings, including the 11 convex forms, and add 14 more they call hollow tilings , using the first two expansions above: star polygon faces and generalized vertex figures.

  5. Dividing a square into similar rectangles - Wikipedia

    en.wikipedia.org/wiki/Dividing_a_square_into...

    However, there are three distinct ways of partitioning a square into three similar rectangles: [1] [2] The trivial solution given by three congruent rectangles with aspect ratio 3:1. The solution in which two of the three rectangles are congruent and the third one has twice the side length of the other two, where the rectangles have aspect ...

  6. CfA 1.2 m Millimeter-Wave Telescope - Wikipedia

    en.wikipedia.org/wiki/CfA_1.2_m_Millimeter-Wave...

    The antenna system consists of a 1.2 m parabolic primary and 17.8 cm hyperbolic secondary in a Cassegrain configuration with effective f/D=2.8. The antenna primary is a monolithic aluminum casting with f/D=0.375, numerically milled by Philco Ford to 40 μm surface accuracy (l/65 at 115 GHz). The telescope's focus, beam pattern, and main ...

  7. 7.62×51mm NATO - Wikipedia

    en.wikipedia.org/wiki/7.62×51mm_NATO

    Cartridge, caliber 7.62mm, NATO, ball, special, M118LR: 175-grain (11.3 g) 7.62×51mm NATO match-grade round specifically designed for long-range sniping. It uses a 175-grain (11.3 g) Sierra Match King hollow point boat-tail bullet with a ballistic coefficient (G7 BC) of 0.243. [94] Produced at Lake City Army Ammunition Plant.

  8. Letter (paper size) - Wikipedia

    en.wikipedia.org/wiki/Letter_(paper_size)

    The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices. [2]

  9. Laplace–Runge–Lenz vector - Wikipedia

    en.wikipedia.org/wiki/Laplace–Runge–Lenz_vector

    Thus, the motion still lies in a plane perpendicular to L and the magnitude A is conserved, from the equation A 2 = m 2 k 2 + 2mEL 2. The perturbation potential h ( r ) may be any sort of function, but should be significantly weaker than the main inverse-square force between the two bodies.