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No way to get on top ahead of yahoo answers now for those phrases
Also, there is no prohibition against answering questions yourself and mentioning your own article as long as the reference is specifically relevant to the answer. (There is a prohibition against posting irrelevant links.)
It's a lot of work to promote your articles this way, but there are people doing it. I answer a few questions once in a while and find it fun.
I thought Answers looked sort of pointless at first since virtually any question can be answered with a web search, but many of the askers, I think, are kids or others with not a lot of internet experience. Its apparent popularity inspired an interesting discovery for me: different people like to get their information in different ways. Some prefer web searches; some prefer forums; some prefer a place like Answers, extremely informal. Different formats for different preferences.
and one of this published information ranks all other sites
Yahoo! Answers is certainly a strong presence, with a lot of user-generated content and strong interlinking of their answer pages, but I wouldn't consider it a "threat to content publishers," at least not more so than any other content site, when it comes to search engine rankings.