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  2. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For example, the square root of a number is the same as raising the number to the power of and the cube root of a number is the same as raising the number to the power of . Examples are 4 = 4 1 2 = 2 {\displaystyle {\sqrt {4}}=4^{\frac {1}{2}}=2} and 27 3 = 27 1 3 = 3 {\displaystyle {\sqrt[{3}]{27}}=27^{\frac {1}{3}}=3} .

  3. Question answering - Wikipedia

    en.wikipedia.org/wiki/Question_answering

    An example of an open-domain question is "What did Albert Einstein win the Nobel Prize for?" while no article about this subject is given to the system. Another way to categorize question-answering systems is by the technical approach used. There are a number of different types of QA systems, including rule-based systems, statistical systems, and

  4. History of science - Wikipedia

    en.wikipedia.org/wiki/History_of_science

    They also tried to standardize measurement of length to a high degree of accuracy. They designed a ruler—the Mohenjo-daro ruler—whose unit of length (approximately 1.32 inches or 3.4 centimeters) was divided into ten equal parts. Bricks manufactured in ancient Mohenjo-daro often had dimensions that were integral multiples of this unit of ...

  5. Radian - Wikipedia

    en.wikipedia.org/wiki/Radian

    One radian is defined as the angle at the center of a circle in a plane that subtends an arc whose length equals the radius of the circle. [6] More generally, the magnitude in radians of a subtended angle is equal to the ratio of the arc length to the radius of the circle; that is, =, where θ is the magnitude in radians of the subtended angle, s is arc length, and r is radius.

  6. Emissivity - Wikipedia

    en.wikipedia.org/wiki/Emissivity

    Emissivity of a body at a given temperature is the ratio of the total emissive power of a body to the total emissive power of a perfectly black body at that temperature. Following Planck's law , the total energy radiated increases with temperature while the peak of the emission spectrum shifts to shorter wavelengths.

  7. List of United States cities by population - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    This is a list of the most populous municipal corporations of the United States.As defined by the United States Census Bureau, an incorporated place includes cities, towns, villages, boroughs, and municipalities.

  8. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    By comparison, the total mass of all the stars in the Milky Way is estimated to be between 4.6 × 10 10 M ☉ [146] and 6.43 × 10 10 M ☉. [ 141 ] In addition to the stars, there is also interstellar gas, comprising 90% hydrogen and 10% helium by mass, [ 147 ] [ unreliable source? ] with two thirds of the hydrogen found in the atomic form and ...

  9. Proportional representation - Wikipedia

    en.wikipedia.org/wiki/Proportional_representation

    For example, Mollison in his 2010 plan for STV for the UK divided the country into 143 districts and then allocated varying number of seats to each district (to add up to the existing total of 650 MPs) depending on the number of voters in each but with wide ranges (his five-seat districts include one with 327,000 voters and another with 382,000 ...