Examples in home page atm (not exhaustive and obviously prone to change, now that they're in home page):
https://news.ycombinator.com/item?id=38590164 - 3 pts, 0 comments, ranking 7th https://news.ycombinator.com/item?id=38590144 - 5 pts, 1 comment, ranking 8th https://news.ycombinator.com/item?id=38574174 - 4 pts, 1 comment
Relatively few people look at /new, and fewer upvote.
So a few upvotes are enough to get a low front page placement, but if the submission doesn't get many upvotes and/or comments it gets dropped pretty quickly again.