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Okay, so I just bought some DVDs. They are suppose to be region 2 but when I pop them into my computer they played with no problem. This is great and all but the thing is my computer is set to Region 1. Did I get some fake DVDs? I would think so...but the quality is really good and they look...

Here are the questions I'm given... I have no idea where to began... Since every reaction has an equal and opposite reaction, we can derive the motions of the sun (the opposite reaction) by assuming that the motion will be proportional to the ratio of the masses of the planet and Sun. In other...