Certainly. Just make sure to categorize your question in the physics category and someone who knows physics well will try to respond.
Finding tutor for high level college physics is a tough job but you can get College Physics tutoring at various online tutoring websites. Or, you can simply ask your question here. Many of the questions you have are likely already asked on WikiAnswers.
Yes , you can answer the questions on wikianswers.
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WikiAnswers visitors ask questions. You wrote this one! :-)
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Wikianswers does not answer your questions. It is people from around the globe on the internet that answer the questions.
You cannot demand answers from WikiAnswers on your questions. WikiAnswers does not answer your questions, it is the members of this community that answer your questions. You can request for your question to be answered but not demand for the same.
You can recategorize, answer questions, edit questions, and do much more on WikiAnswers.