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For example, to calculate the dynamics of a billiard ball being struck, one can approximate the force of the impact by a Dirac delta. In doing so, one not only simplifies the equations, but one also is able to calculate the motion of the ball, by only considering the total impulse of the collision, without a detailed model of all of the elastic ...
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. [1] [2] It is named after the Austrian physicist and philosopher Ernst Mach. =, where: M is the local Mach number,
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation (particle radiation and high-energy electromagnetic radiation), [1] especially for environments in outer space (especially beyond low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear ...
The Mikoyan MiG-29 (Russian: Микоян МиГ-29; NATO reporting name: Fulcrum) is a twin-engine fighter aircraft designed in the Soviet Union.Developed by the Mikoyan design bureau as an air superiority fighter during the 1970s, the MiG-29, along with the larger Sukhoi Su-27, was developed to counter U.S. fighters such as the McDonnell Douglas F-15 Eagle and the General Dynamics F-16 ...
The animal was shot by the police. The zoo was widely criticized for maintaining only a 12.5 ft (3.8 m) fence around the tiger enclosure, while the international standard is 16 ft (4.9 m). The zoo subsequently erected a taller barrier topped by an electric fence. One of the victims admitted to taunting the animal. [97]
Typha / ˈ t aɪ f ə / is a genus of about 30 species of monocotyledonous flowering plants in the family Typhaceae.These plants have a variety of common names, in British English as bulrush [4] or (mainly historically) reedmace, [5] in American English as cattail, [6] or punks, in Australia as cumbungi or bulrush, in Canada as bulrush or cattail, and in New Zealand as reed, cattail, bulrush ...
A TEM image of a cluster of poliovirus.The polio virus is 30 nm in diameter. [1] Operating principle of a transmission electron microscope. Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image.
The 25 m Chilbolton telescope in England detected radio signatures of ammonia in H II regions, HNH 2 O masers, H–H objects, and other objects associated with star formation. A comparison of emission line widths indicates that turbulent or systematic velocities do not increase in the central cores of molecular clouds.