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  2. Darcy friction factor formulae - Wikipedia

    en.wikipedia.org/wiki/Darcy_friction_factor_formulae

    The equation was found to match the Colebrook–White equation within 0.0023% for a test set with a 70-point matrix consisting of ten relative roughness values (in the range 0.00004 to 0.05) by seven Reynolds numbers (2500 to 10 8).

  3. BASIC - Wikipedia

    en.wikipedia.org/wiki/BASIC

    BASIC (Beginners' All-purpose Symbolic Instruction Code) [1] is a family of general-purpose, high-level programming languages designed for ease of use. The original version was created by John G. Kemeny and Thomas E. Kurtz at Dartmouth College in 1963.

  4. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It is a slab of white marble 149 cm (59 in) in length, 75 cm (30 in) wide, and 4.5 cm (2 in) thick, on which are 5 groups of markings. In the tablet's center is a set of 5 parallel lines equally divided by a vertical line, capped with a semicircle at the intersection of the bottom-most horizontal line and the single vertical line.

  5. Quotient space (linear algebra) - Wikipedia

    en.wikipedia.org/wiki/Quotient_space_(linear...

    Formally, the construction is as follows. [1] Let be a vector space over a field, and let be a subspace of .We define an equivalence relation on by stating that iff .That is, is related to if and only if one can be obtained from the other by adding an element of .

  6. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    According to a report published by the Water Footprint organization in 2010, a single kilogram of beef requires 15 thousand litres (3.3 × 10 ^ 3 imp gal; 4.0 × 10 ^ 3 US gal) of water; however, the authors also make clear that this is a global average and circumstantial factors determine the amount of water used in beef production.

  7. Military budget of the United States - Wikipedia

    en.wikipedia.org/wiki/Military_budget_of_the...

    Military budget of China, USSR, Russia and US in constant 2021 US$ billions Military spending as a percent of federal government revenue. The military budget of the United States is the largest portion of the discretionary federal budget allocated to the Department of Defense (DoD), or more broadly, the portion of the budget that goes to any military-related expenditures.

  8. YouTube - Wikipedia

    en.wikipedia.org/wiki/YouTube

    It features a simplified user interface, curated selections of channels featuring age-appropriate content, and parental control features. [73] Also in 2015, YouTube launched YouTube Gaming—a video gaming -oriented vertical and app for videos and live streaming, intended to compete with the Amazon.com -owned Twitch .

  9. Obesity in the United States - Wikipedia

    en.wikipedia.org/wiki/Obesity_in_the_United_States

    From 1980 to 2008, the prevalence of obesity in children aged 6 to 11 years tripled from 6.5% to 19.6%. The prevalence of obesity in teenagers more than tripled from 5% to 18.1% in the same time frame. [76] In less than one generation, the average weight of a child has risen by 5 kg in the United States. [77]