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  2. Betz mystery sphere - Wikipedia

    en.wikipedia.org/wiki/Betz_mystery_sphere

    On March 27, 1974, the Betz family investigated a small brush fire near their residence in Fort George Island, Florida. [3][4] The family of three, Antoine, Jerri, and son Terry, came across a small metal sphere the size of a bowling ball. Their first thought was the sphere had been a cannonball left from New World conquistadors.

  3. Newton's cradle - Wikipedia

    en.wikipedia.org/wiki/Newton's_cradle

    Newton's cradle. 3-D rendering of the cradle in motion. Newton's cradle is a device, usually made of metal, that demonstrates the principles of conservation of momentum and conservation of energy in physics with swinging spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, compressing them and thereby ...

  4. Ball (bearing) - Wikipedia

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

    Ball (bearing) Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings, but also used as components in things like freewheel mechanisms. The balls themselves are commonly referred to as ball bearings. [1] This is an example of a synecdoche. The balls come in many different grades.

  5. Brinell scale - Wikipedia

    en.wikipedia.org/wiki/Brinell_scale

    The "10" is the ball diameter in millimeters. The "3000" is the force in kilograms force. The hardness may also be shown as XXX HB YYD 2. The XXX is the force to apply (in kgf) on a material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels). Thus a typical steel hardness could be written: 250 HB 30D 2. It could be a ...

  6. Stainless steel - Wikipedia

    en.wikipedia.org/wiki/Stainless_steel

    Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an alloy of iron that is resistant to rusting and corrosion. It contains iron with chromium and other elements such as molybdenum, carbon, nickel and nitrogen depending on its specific use and cost. Stainless steel's resistance to corrosion results ...

  7. Baoding balls - Wikipedia

    en.wikipedia.org/wiki/Baoding_balls

    An average user should be able to start with a 45 mm (1.8 in) ball and move up to 60 mm (2.4 in) as their muscles get accustomed to the exercise. Larger Baoding balls between 70 mm and 100 mm (2.8 in to 3.9 in) can be used. Keeping larger balls separate while rotating them is an advanced skill.

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