Many Solids are made of crystals like salt, sugar, or quartz. Briefly describe the arrangement of atoms in crystals compared to non-crystalline solids or amorphous solids like rubber or plastics.

Arock collection comes from which part of earth?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

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.