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Séance de cours

La cinématique fluide : concepts et méthodes

Concepts associés (23)

Proper acceleration

In relativity theory, proper acceleration is the physical acceleration (i.e., measurable acceleration as by an accelerometer) experienced by an object. It is thus acceleration relative to a free-fall, or inertial, observer who is momentarily at rest relative to the object being measured. Gravitation therefore does not cause proper acceleration, because the same gravity acts equally on the inertial observer. As a consequence, all inertial observers always have a proper acceleration of zero.

Bootstrapable builds

Bootstrapable builds, a process of compiling software that doesn't depend on (compiler) binaries that aren't build from source by this process. This process can protect against compiler backdoors: if the build process doesn't depend on binary code that is difficult to audit, then a compiler backdoor cannot be hidden in compiler binaries anymore. A way to tackle the issue for a Software distributions is to reduce the size of the binaries used to bootstrap the distribution until there are not needed anymore or that the size is small enough to be easily reviewed by humans.

Vecteur position

En géométrie, le vecteur position, ou rayon vecteur, est le vecteur qui sert à indiquer la position d'un point par rapport à un repère. L'origine du vecteur se situe à l'origine fixe du repère et son autre extrémité à la position du point. Si l'on note M cette position et O l'origine, le vecteur position se note . On le note aussi ou . En physique, le vecteur déplacement d'un point matériel ou d'un objet est le vecteur reliant une ancienne position à une nouvelle, donc le vecteur position final moins le vecteur position initial.