Mechanics

Mechanical quantities Name Symbol Weight G, P, W Time t Height h Pressure p Diameter d Length l Path length s Amount of substance ν, n Momentum p Stiffness coefficient k Safety factor k, n Efficiency η Coefficient of rol…

Year Event Scientist or inventor 5th-4th centuries BC The idea was put forward that matter has a granular structure and that the atom is the simplest and indivisible particle Democritus 3rd century BC A theory of the lev…

V.L. Andreev E – mail: avl130740@yandex.ru “The process of scientific discovery is, in essence, a continual flight from wonder”.

10. Thus the electrons in the atom do not constantly “wind” circles in the field of the central forces of the nucleus, but perform oscillations in this field, in the course of which there occurs a continuous transition o…

V.M.Yurovitsky, Moscow Humanity's entry into space compels a fresh interpretation of many mechanical concepts.

The bicycle is becoming an ever more popular means of transport in our day, when there are so many cars that they get in each other's way.

Water is one of the most interesting physical phenomena, able to take several forms.

Barotropic phenomenon , consists in the fact that in liquid — liquid systems (liquid — gas or gas — gas), at high pressures and certain temperatures, the coexisting phases change places: the phase that lies above (in the…

White dwarfs , compact stars with masses of the order of the mass of the Sun M ο and radii ≈1% of the radius of the Sun R ο ; they make up 3—10% of the total number of stars in the Galaxy.

Bernoulli equation (the Bernoulli integral) in hydroaeromechanics [[after the Swiss scientist D.

Boltzmann distribution , the statistically equilibrium distribution function over the momenta p and the coordinates r of the particles of an ideal gas whose molecules move according to the laws of classical mechanics, in…

Brownian motion , (Braunian motion), the disorderly motion of small particles suspended in a liquid or a gas, which takes place under the impacts of the molecules of the surrounding medium.

Bar , a deformable solid whose transverse dimensions are noticeably smaller than its longitudinal one.

Gas dynamics - the branch of fluid mechanics that studies the motion of compressible continuous media (gas, plasma) and their interaction with solid bodies.

Pressure , a physical quantity characterising the intensity of the normal (perpendicular to the surface) forces with which one body acts on the surface of another (for example, the foundation of a building on the ground,…

Unified field theory , a unified theory of matter, intended to reduce the variety of the properties of elementary particles and of the laws of their mutual transformation (interaction) to a few universal principles.

An abstract (mathematical) model of a deformable solid, based on the possibility of neglecting, in a number of cases, the elastic strains of the body in comparison with the plastic ones.

Stiffness , a measure of a body's compliance to deformation under a given type of load: the greater the stiffness, the smaller the deformation.

An imaginary fluid devoid of viscosity and thermal conductivity.

Drop , a small volume of liquid which in equilibrium is bounded by a surface of revolution.