3 Pourquoi dit-on qu’un ampèremètre est un appareil polarisé ?
Schématiser un circuit simple allumage.
Ajouter l'appareil nécessaire pour mesurer l'intensité
du courant. Repérer par un point rouge sa borne
d'entrée et par un point noir sa borne de sortie.​

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

Properties seen when one one substance changes to another are known as properties

2) a cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. which one of the following graphs best describes the buoyant force b on this block as a function of time t if the block just enters the water at time t = 0 s?