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CONSERVATION ANGULAR MOMENTUM [1 record]

Record 1 2010-11-16

English

Subject field(s)
  • Atomic Physics
DEF

The principle that the total angular momentum of a system has constant magnitude and direction if the system is subjected to no external force.

CONT

Angular momentum is a vector quantity, requiring the specification of both a magnitude and a direction for its complete description … For a given object or system isolated from external forces, the total angular momentum is a constant, a fact that is known as the law of conservation of angular momentum. A rigid spinning object, for example, continues to spin at a constant rate and with a fixed orientation unless influenced by the application of an external torque. (The rate of change of the angular momentum is, in fact, equal to the applied torque.)

French

Domaine(s)
  • Physique atomique
CONT

Il convient de rappeler que les transmutations nucléaires, qu’elles soient spontanées – cas de la radioactivité – ou provoquées – cas des réactions […] sont soumises aux lois ou principes de conservation : — la loi de conservation de l’énergie totale d’un système isolé ou placé dans un champ extérieur constant (donc ne dépendant pas du temps) qui découle de l’uniformité du temps; — la loi de conservation de l’impulsion qui résulte de l’homogénéité de l’espace; — la loi de conservation du moment cinétique total qui découle de l’isotropie de l’espace […]

OBS

Cette loi de conservation est d’une extrême utilité, s’appliquant tout aussi bien aux galaxies, au mouvement planétaire qu’aux atomes et aux noyaux.

Spanish

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