Le coca-cola® est une boisson acide de pH = 2.8. 1/ Que se passe-t-il si on met du cola en contact avec
une casserole en fer ?
2/ Les canettes de coca-cola, fabriquées en acier
(alliage fer-carbone) sont recouvertes, à l’intérieur,
d’un film plastique. Explique pourquoi.

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)