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Right-hand rule. In mathematics and physics, the right-hand rule is a convention and a mnemonic, utilized to define the orientation of axes in three-dimensional space and to determine the direction of the cross product of two vectors, as well as to establish the direction of the force on a current-carrying conductor in a magnetic field.
FBI mnemonics. The various FBI mnemonics (for electric motors) show the direction of the force on a conductor carrying a current in a magnetic field as predicted by Fleming's left hand rule for motors [ 1] and Faraday's law of induction . Other mnemonics exist that use a right hand rule for predicting resulting motion from a preexisting current ...
Rule of thumb. In English, the phrase rule of thumb refers to an approximate method for doing something, based on practical experience rather than theory. [ 1][ 2][ 3] This usage of the phrase can be traced back to the 17th century and has been associated with various trades where quantities were measured by comparison to the width or length of ...
Impressive, statement-making, wow-worthy accent wall ideas bring instant character and one-of-a-kind style to your home. Featuring wood, wallpaper, paint, tile, and more, these focal points ...
Finger-counting, also known as dactylonomy, is the act of counting using one's fingers. There are multiple different systems used across time and between cultures, though many of these have seen a decline in use because of the spread of Arabic numerals . Finger-counting can serve as a form of manual communication, particularly in marketplace ...
The rule of thirds is a "rule of thumb" for composing visual images such as designs, films, paintings, and photographs. [ 3] The guideline proposes that an image should be imagined as divided into nine equal parts by two equally spaced horizontal lines and two equally spaced vertical lines, and that important compositional elements should be ...
The overhand is the simplest of the single-strand stopper knots, and is tied with one end around its own standing part, its purpose being to prevent unreeving. 47. The half knot is a binding knot, being the first movement of the reef or square knot. It is tied with two ends around an object and is used when reefing, furling, and tying up ...
Hamsa. A hanging hamsa in Tunisia. The hamsa ( Arabic: خمسة, romanized : khamsa, lit. 'five', referring to images of 'the five fingers of the hand'), [ 1][ 2][ 3] also known as the hand of Fatima, [ 4] is a palm-shaped amulet popular throughout North Africa and in the Middle East and commonly used in jewellery and wall hangings. [ 5][ 6 ...