پەیوەندیدانی زانیاری پەیوەندیدانی کۆتایی
it is inversely proportional to the radius of the disk (therefore to its size)
ray
from the diameter of the disk
from the surface of the disk
from 3 times
from the time it takes for the disk to bring the cluster to the right position.
give 3 sub-tempos