B) Calculer l'intensité du courant qu'elle débite quand la tension à ses bornes vaut U = 3,2 V. On dispose d'une pile, de f. e.m. 12,0 V, de résistance intérieure 1,50 Homme
a) Ecrire l'équation de sa caractéristique U = f(1).

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.