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  2. Chuí (Chinese weapon) - Wikipedia

    en.wikipedia.org/wiki/Chuí_(Chinese_weapon)

    Chuí (simplified Chinese: 锤; traditional Chinese: 錘; lit. 'hammer/mace') is a Chinese melee weapon that consists of a large, solid metal sphere on the end of a medium-long handle. [1] This weapon was traditionally used with brute force, as the strength needed to heft such weapons was considerable.

  3. Demon core - Wikipedia

    en.wikipedia.org/wiki/Demon_core

    The demon core (like the core used in the bombing of Nagasaki) was, when assembled, a solid 6.2-kilogram (14 lb) sphere measuring 8.9 centimeters (3.5 in) in diameter.. It consisted of three parts made of plutonium-gallium: two hemispheres and an anti-jet ring, designed to keep neutron flux from "jetting" out of the joined surface between the hemispheres during implosi

  4. Ball (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Ball_(mathematics)

    In mathematics, a ball is the solid figure bounded by a sphere; it is also called a solid sphere. [1] It may be a closed ball (including the boundary points that constitute the sphere) or an open ball (excluding them).

  5. Spherical cap - Wikipedia

    en.wikipedia.org/wiki/Spherical_cap

    An example of a spherical cap in blue (and another in red) In geometry, a spherical cap or spherical dome is a portion of a sphere or of a ball cut off by a plane.It is also a spherical segment of one base, i.e., bounded by a single plane.

  6. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    The solid angle subtended at the corner of a cube (an octant) or spanned by a spherical octant is π /2 sr, one-eight of the solid angle of a sphere. [1] Solid angles can also be measured in square degrees (1 sr = (180/ π) 2 square degrees), in square arc-minutes and square arc-seconds, or in fractions of the sphere (1 sr = ⁠ 1 / 4 π ...

  7. Betz mystery sphere - Wikipedia

    en.wikipedia.org/wiki/Betz_mystery_sphere

    The Betz mystery sphere is a metal sphere with an approximate diameter of 8 inches (20 cm) weighing nearly 22 pounds (10 kg) uncovered in 1974 by a family in Florida. [ 1 ] [ a ] Background

  8. n-sphere - Wikipedia

    en.wikipedia.org/wiki/N-sphere

    a 0-sphere is a pair of points ⁠ {, +} ⁠, and is the boundary of a line segment (⁠ ⁠-ball). a 1-sphere is a circle of radius ⁠ ⁠ centered at ⁠ ⁠, and is the boundary of a disk (⁠ ⁠-ball).

  9. Sphere - Wikipedia

    en.wikipedia.org/wiki/Sphere

    An open ball excludes the sphere itself, while a closed ball includes the sphere: a closed ball is the union of the open ball and the sphere, and a sphere is the boundary of a (closed or open) ball. The distinction between ball and sphere has not always been maintained and especially older mathematical references talk about a sphere as a solid.

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