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LG H.
So my idea:
you have two powers to look at. Weight and centrifugal force.
F=8m*g 8 for 8 times
and Fz=mw^2/r
If we set the same, the following applies:
mw^2/r=8m
how you can see the masses cut off
W^2 =8mgr
r is the distance to the pivot point or the radius.
then you can calculate w. And you tell the speed by
N=w/2pi