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A silver Peruvian atlatl from the 12th-15th century Atlatl in use. A spear-thrower, spear-throwing lever, or atlatl (pronounced / ˈ æ t l æ t əl / ⓘ [1] or / ˈ ɑː t l ɑː t əl /; [2] Nahuatl ahtlatl [ˈaʔt͡ɬat͡ɬ]) is a tool that uses leverage to achieve greater velocity in dart or javelin-throwing, and includes a bearing surface that allows the user to store energy during the ...
Spear-thrower or atlatl, a tool that uses leverage to achieve greater velocity in dart-throwing, and includes a bearing surface which allows the user to store energy during the throw; Woomera (spear-thrower), a wooden Australian Aboriginal spear-throwing device similar to an atlatl
A Swiss arrow [1] (also known as a Yorkshire arrow, Dutch arrow, Scotch arrow, or Gypsy arrow) is a type of enlarged dart in the shape of an arrow that is thrown with the aid of a lanyard, which is retained by a small notch close to the fletching. It is very similar to an amentum and uses the same throwing principle as a spear-thrower.
Arrow pushing or electron pushing is a technique used to describe the progression of organic chemistry reaction mechanisms. [1] It was first developed by Sir Robert Robinson . In using arrow pushing, "curved arrows" or "curly arrows" are drawn on the structural formulae of reactants in a chemical equation to show the reaction mechanism .
Depending on your height, you'll want to use a dart that's about a foot taller than you are for better accuracy. Using an atlatl can be easy. Hitting a target is another story.
Arrowheads are attached to arrow shafts to be shot from a bow; similar types of projectile points may be attached to a spear and "thrown" by means of an atlatl (spear thrower). The arrowhead or projectile point is the primary functional part of the arrow, and plays the largest role in determining its purpose. Some arrows may simply use a ...
Using coulombs requires using the Coulomb constant (k) in the equation. Rutherford used b as the turning point distance (called r min above) and R is the radius of the atom. The first term is the Coulomb repulsion used above. This form assumes the alpha particle could penetrate the positive charge.
A microlith is a small stone tool usually made of flint or chert and typically a centimetre or so in length and half a centimetre wide. They were made by humans from around 35,000 years ago, across Europe, Africa, Asia and Australia.