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  2. Airy disk - Wikipedia

    en.wikipedia.org/wiki/Airy_disk

    Airy disk captured by 2000 mm camera lens at f/25 aperture. Image size: 1×1 mm. In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best- focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy .

  3. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = ⁠ 1 2 ⁠ × 2πr × r, holds for a circle.

  4. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    A board foot is a United States and Canadian unit of approximate volume, used for lumber. It is equivalent to 1 inch × 1 foot × 1 foot (144 cu in or 2,360 cm 3). It is also found in the unit of density pounds per board foot. In Australia and New Zealand the terms super foot or superficial foot were formerly used for this unit. The exact ...

  5. Pendulum - Wikipedia

    en.wikipedia.org/wiki/Pendulum

    Pendulum. "Simple gravity pendulum" model assumes no friction or air resistance. A pendulum is a device made of a weight suspended from a pivot so that it can swing freely. [ 1] When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the ...

  6. Circular segment - Wikipedia

    en.wikipedia.org/wiki/Circular_segment

    Circular segment. A circular segment (in green) is enclosed between a secant/chord (the dashed line) and the arc whose endpoints equal the chord's (the arc shown above the green area). In geometry, a circular segment or disk segment (symbol: ⌓) is a region of a disk [ 1] which is "cut off" from the rest of the disk by a straight line.

  7. Lissajous curve - Wikipedia

    en.wikipedia.org/wiki/Lissajous_curve

    A Lissajous figure, made by releasing sand from a container at the end of a Blackburn pendulum. A Lissajous curve / ˈlɪsəʒuː /, also known as Lissajous figure or Bowditch curve / ˈbaʊdɪtʃ /, is the graph of a system of parametric equations. which describe the superposition of two perpendicular oscillations in x and y directions of ...

  8. Skeet shooting - Wikipedia

    en.wikipedia.org/wiki/Skeet_shooting

    For the American version of the sport, the clay discs are 4 + 5 ⁄ 16 inches (109.54 mm) in diameter, 1 + 1 ⁄ 8 inches (28.58 mm) thick, and fly a distance of 62 yards (57 m). The international version of skeet uses a target that is slightly larger in diameter [(110±1) mm vs. 109.54 mm], thinner in cross-section [(25.5±.5) mm vs. 28.58 mm ...

  9. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    The bolt circle diameter is typically expressed in mm and accompanies the number of bolts in your vehicle's bolt pattern. One example of a common bolt pattern is 5x100 mm. This means there are 5 bolts evenly spaced about a 100 mm bolt circle. The picture to the right is an example of a 5×100 mm bolt pattern on a Subaru BRZ. The wheel has 5 lug ...

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