Intro A large and heavy asteroid is observed from a nearby satellite to be stationary. A smaller and lighter
asteroid moving to the right with constant velocity v hits the larger asteroid. You may ignore the
gravitational force of the asteroids on each other.
mom
t
After the larger asteroid is hit, what is the velocity of the center of mass of the system of two asteroids as
seen from the satellite?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.