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  2. Speed - Wikipedia

    en.wikipedia.org/wiki/Speed

    In kinematics, the speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a non-negative scalar quantity. [1]

  3. Velocity - Wikipedia

    en.wikipedia.org/wiki/Velocity

    Velocity is the speed in combination with the direction of motion of an object.Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

  4. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.

  5. High-speed rail in Indonesia - Wikipedia

    en.wikipedia.org/wiki/High-speed_rail_in_Indonesia

    Concepts for high-speed rail (HSR) in Indonesia were first seriously contemplated in 2008, leading to discussions at Asian Investment Summit in 2013, and detailed plans being set forth in 2015. [23]

  6. Rockwell B-1 Lancer - Wikipedia

    en.wikipedia.org/wiki/Rockwell_B-1_Lancer

    The Rockwell B-1 Lancer [b] is a supersonic variable-sweep wing, heavy bomber used by the United States Air Force.It has been nicknamed the "Bone" (from "B-One"). [2] [3] As of 2024, it is one of the United States Air Force's three strategic bombers, along with the B-2 Spirit and the B-52 Stratofortress.

  7. Student's t-test - Wikipedia

    en.wikipedia.org/wiki/Student's_t-test

    Student's t-test is a statistical test used to test whether the difference between the response of two groups is statistically significant or not. It is any statistical hypothesis test in which the test statistic follows a Student's t-distribution under the null hypothesis.

  8. Time complexity - Wikipedia

    en.wikipedia.org/wiki/Time_complexity

    Graphs of functions commonly used in the analysis of algorithms, showing the number of operations N as the result of input size n for each function. In theoretical computer science, the time complexity is the computational complexity that describes the amount of computer time it takes to run an algorithm.

  9. Sukhoi Su-57 - Wikipedia

    en.wikipedia.org/wiki/Sukhoi_Su-57

    The Sukhoi Su-57 (Russian: Сухой Су-57; NATO reporting name: Felon) [5] [6] is a twin-engine stealth multirole fighter aircraft developed by Sukhoi. [7] It is the product of the PAK FA (Russian: ПАК ФА, prospective aeronautical complex of front-line aviation) programme, which was initiated in 1999 as a more modern and affordable alternative to the MFI (Mikoyan Project 1.44/1.42).