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  2. The Method of Mechanical Theorems - Wikipedia

    en.wikipedia.org/wiki/The_Method_of_Mechanical...

    The condition of balance ensures that the volume of the cone plus the volume of the sphere is equal to the volume of the cylinder. The volume of the cylinder is the cross section area, times the height, which is 2, or . Archimedes could also find the volume of the cone using the mechanical method, since, in modern terms, the integral involved ...

  3. Parabola - Wikipedia

    en.wikipedia.org/wiki/Parabola

    The intersection of an upright cone by a plane , whose inclination from vertical is the same as a generatrix (a.k.a. generator line, a line containing the apex and a point on the cone surface) of the cone, is a parabola (red curve in the diagram).

  4. Moment of inertia - Wikipedia

    en.wikipedia.org/wiki/Moment_of_inertia

    Here, the function gives the mass density at each point (,,), is a vector perpendicular to the axis of rotation and extending from a point on the rotation axis to a point (,,) in the solid, and the integration is evaluated over the volume of the body . The moment of inertia of a flat surface is similar with the mass density being replaced by ...

  5. Water tower - Wikipedia

    en.wikipedia.org/wiki/Water_tower

    Beaumont St. Louis and San Francisco Railroad Water Tank (1875, restored 2012), Beaumont, Kansas, US. Although the use of elevated water storage tanks has existed since ancient times in various forms, the modern use of water towers for pressurized public water systems developed during the mid-19th century, as steam-pumping became more common, and better pipes that could handle higher pressures ...

  6. Divisor (algebraic geometry) - Wikipedia

    en.wikipedia.org/wiki/Divisor_(algebraic_geometry)

    Let X be the quadric cone of dimension 3, defined by the equation xy = zw in affine 4-space over a field. Then the plane D in X defined by x = z = 0 cannot be defined in X by one equation near the origin, even as a set. It follows that D is not Q-Cartier on X; that is, no positive multiple of D is Cartier.

  7. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    The C/A code, for civilian use, transmits data at 1.023 million chips per second, whereas the P code, for U.S. military use, transmits at 10.23 million chips per second. The actual internal reference of the satellites is 10.22999999543 MHz to compensate for relativistic effects [ 168 ] [ 169 ] that make observers on the Earth perceive a ...

  8. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    There's a winamp plugin that lets it play m4a. So you can use winamp to play them, or you can use winamp to decode it to a wav (and then you can use any of a dozen programs to reencode it as an mp3) Raul654 10:58, 1 December 2005 (UTC) However, note that every time you convert from one lossy format to another, it sounds a little worse. Encoding ...

  9. Soil mechanics - Wikipedia

    en.wikipedia.org/wiki/Soil_mechanics

    According to the Unified Soil Classification System, a #4 sieve (4 openings per inch) having 4.75 mm opening size separates sand from gravel and a #200 sieve with an 0.075 mm opening separates sand from silt and clay. According to the British standard, 0.063 mm is the boundary between sand and silt, and 2 mm is the boundary between sand and gravel.