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The United States dollar ( symbol: $; currency code: USD; also abbreviated US$ to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official currency of the United States and several other countries.
Viète. de Moivre. Euler. Fourier. v. t. e. In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.
- List of Si Prefixes
- Usage
- Application to Units of Measurement
- Non-Standard Prefixes
- Similar Symbols and Abbreviations
- External Links
The BIPM specifies twenty-four prefixes for the International System of Units (SI). The first uses of prefixes in SI date back to the definition of kilogram after the French Revolution at the end of the 18th century. Several more prefixes came into use, and were recognised by the 1947 IUPAC 14th International Conference of Chemistrybefore being off...
Examples
1. The mass of an electron is about 1 rg (rontogram).[a] 2. The mass of 1 litre of wateris about 1 kg (kilogram). 3. The mass of the Earthis about 6 Rg (ronnagrams). 4. The mass of Jupiteris about 2 Qg (quettagrams).
Examples of powers of units with metric prefixes
1. 1 km2 means one square kilometre, or the area of a square of 1000 m by 1000 m. In other words, an area of 1000000 square metres and not 1000 square metres. 2. 2 Mm3 means two cubic megametres, or the volume of two cubes of 1000000 m by 1000000 m by 1000000 m, i.e. 2×1018 m3, and not 2000000 cubic metres (2×106 m3).
Examples with prefixes and powers
1. 5 mV × 5 mA = 5×10−3 V × 5×10−3 A = 25×10−6 V⋅A = 25 μW. 2. 5.00 mV + 10 μV = 5.00 mV + 0.01 mV = 5.01 mV. 3. 5 cm = 5×10−2 m = 5 × 0.01 m= 0.05 m. 4. 9 km2 = 9 × (103 m)2 = 9 × (103)2 × m2 = 9×106 m2 = 9 × 1000000 m2 = 9000000 m2. 5. 3 MW = 3×106 W = 3 × 1000000 W = 3000000 W.
The use of prefixes can be traced back to the introduction of the metric system in the 1790s, long before the 1960 introduction of the SI.[citation needed]The prefixes, including those introduced after 1960, are used with any metric unit, whether officially included in the SI or not (e.g., millidyne and milligauss). Metric prefixes may also be used...
Obsolete metric prefixes
Some of the prefixes formerly used in the metric system have fallen into disuse and were not adopted into the SI. The decimal prefix for ten thousand, myria- (sometimes spelt myrio-), and the early binary prefixes double- (2×) and demi- (1/2×) were parts of the original metric system adopted by France in 1795,[c]but were not retained when the SI prefixes were internationally adopted by the 11th CGPM conferencein 1960. Other metric prefixes used historically include hebdo- (107) and micri- (10...
Double prefixes
Double prefixes have been used in the past, such as micromillimetres or millimicrons (now nanometres), micromicrofarads (μμF; now picofarads, pF), kilomegatonnes (now gigatonnes), hectokilometres (now 100 kilometres) and the derived adjective hectokilometric (typically used for qualifying the fuel consumption measures).These are not compatible with the SI. Other obsolete double prefixes included "decimilli-" (10−4), which was contracted to "dimi-"and standardised in France up to 1961. There a...
In written English, the symbol K is often used informally to indicate a multiple of thousand in many contexts. For example, one may talk of a 40K salary (40000), or call the Year 2000 problem the Y2K problem. In these cases, an uppercase K is often used with an implied unit (although it could then be confused with the symbol for the kelvin temperat...
US NIST Definitions of the SI units: The twenty SI prefixesUS NIST Definitions of the SI units: The binary prefixesThe Tortured Poets Department [a] is the eleventh studio album by the American singer-songwriter Taylor Swift, released on April 19, 2024, through Republic Records. It was expanded into a double album two hours after its release, subtitled The Anthology, containing a second volume of songs.
The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan, a Continental Army aide to General George Washington, wrote to Joseph Reed, Washington's aide-de-camp, seeking to go "with full and ample powers from the United States of America to Spain" to seek assistance in the Revolutionary War effort.
The millimetre ( international spelling; SI unit symbol mm) or millimeter ( American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.
Elon Reeve Musk (/ˈiːlɒn/; born June 28, 1971) is a businessman and investor known for his key roles in space company SpaceX and automotive company Tesla, Inc. Other involvements include ownership of X Corp., formerly Twitter, and his role in the founding of The Boring Company, xAI, Neuralink and OpenAI. He is one of the wealthiest people ...
