Two rocks collide in outer space. Before the collision, one rock had mass 9 kg and velocity < 4700, -3100, 2300> m/s. The other rock had mass 5 kg and velocity < -400, 2200, 3600> m/s. A 3 kg chunk of the first rock breaks off and sticks to the second rock. After the collision the 6 kg rock has velocity < 1800, 650, 1500> m/s. After the collision, what is the velocity of the other rock, whose mass is now 8 kg

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?