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Well, not sure if this is helpful, but...
An LP spins at 33 1/3 rpm (revolutions per minute), is about 30cm wide, and playing time per side is about 30 min (all this I got from Wikipedia)
yer its using a balance would this chande thins plus how long is a groove in a record?
For the first one see here: Weighting 12 Pool Balls That puzzle is harder than yours, because YOU know one is lighter.
hi need help for tomorrow desperate ahhhh