8) in a bumper car arena, two cars of equal mass are heading straight toward each other. the orange car is traveling at a velocity of 5 m s . the green car is traveling at a velocity of 2 m s . after the collision, both cars move off in the direction in which the orange car was travelling with a velocity of 1.5 m s . which car has the largest change in velocity? a) green, because its velocity was slower b) green, because it changed direction c) orange, because it changed direction d) neither, because they both change equally

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.