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Momentum print that page


In classical mechanics , momentum ( pl. momenta; SI unit kg · m/s , or, equivalently, N · s ) is the product of the mass and velocity of an object ( ). Like velocity, momentum is a vector quantity, possessing a direction as well as a magnitude. Momentum is a conserved quantity

Angular momentum print that page


In physics , angular momentum , moment of momentum , or rotational momentum [ 1 ] [ 2 ] is a conserved vector quantity that can be used to describe the overall state of a physical system. The angular momentum L of a particle with respect to some point of origin is where r is the

Conservation law print that page

In physics , a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves. One particularly important physical result concerning conservation laws is Noether's Theorem , which states that there is a one-to-one correspondence

wikipedia.org | 2010/9/25 16:13:52

Architectural conservation print that page


Architectural conservation deals with issues of prolonging the life and integrity of architectural character and integrity, such as form and style, and/or its constituent materials, such as stone, brick, glass, metal, and wood. In this sense, the term refers to the "professional use of a combination

Salmon conservation print that page


they may just be masking a problem instead of getting to the root of it. [ 2 ] Other methods of conservation may include limiting or eliminating harvests of the run, protecting water quality or reducing water extraction for human consumption, and protecting the habitat. In the last 20 years

Conservation of energy print that page

The law of conservation of energy is a law of physics. It states that the total amount of energy in a system remains constant over time (is said to be conserved over time). A consequence of this law is that energy can neither be created nor destroyed: it can only be transformed from one

wikipedia.org | 2011/5/25 22:08:37

Conservation of mass print that page

The law of conservation of mass , also known as the principle of mass/matter conservation , states that the mass of a closed system (in the sense of a completely isolated system) will remain constant over time. This principle is equivalent to the conservation of energy, in the sense when

wikipedia.org | 2011/9/30 0:13:12

Angular momentum coupling print that page

In astronomy , spin-orbit coupling reflects the general law of conservation of angular momentum , which holds for celestial systems as well. In simple cases, the direction of the angular momentum vector is neglected, and the spin-orbit coupling is the ratio between the frequency with

wikipedia.org | 2011/5/10 20:48:17

Four-momentum print that page

In special relativity , four momentum is the generalization of the classical three-dimensional momentum to four-dimensional spacetime . Momentum is a vector in three dimensions; similarly four momentum is a four-vector in spacetime . The contravariant four momentum of a particle with

wikipedia.org | 2011/10/4 12:11:55

Special relativity print that page


10 Relativistic mechanics 10.1 Mass–energy equivalence 10.1.1 The mass of systems and conservation of invariant mass