Le trajet Bordeaux-Toulouse comporte 234 km d'auto- route sur laquelle la vitesse est limitée à 130 km/h par
a tra-
utes.
beau temps.
1. Calculer le temps mis par une voiture qui parcourt ce
trajet à la vitesse constante de 130 km/h.
7el.
2.Quel temps mettra un automobiliste qui roule à 140 km/h. 3.Calculer en heure puis en minutes l'écart de temps entre les deux trajets.conclure sur l'intérêt de respecter la limitation de vitesse. aider moi s'ils vous plait

The base of a 50-meter tower is at the origin; the base of a 50-meter tree is at (0, 50, 0). the ground is flat and the z-axis points upward. the following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i) r (t) = (50 + t2)k (ii) r (t) = 2t2 j + 2t2k (iii) r (t) = 50 i + 50 j + (50 − t2)k (iv) r (t) = 2t j + (50 − t2)k (v) r (t) = (50 − 2t) i + 2t j + (50 − t)k (vi) r (t) = t i + t j + tk (a) which projectile is launched from the top of the tower and goes downward? at time t = , the projectile hits the ground at point (x, y, z) = . (b) which projectile hits the top of the tree?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?