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For those who learn visually rather than algebraically (which often includes...
me), try this. Sorry to use words to describe a picture, but if we step
through this one step at a time, and if I am successful in conveying the
picture, I promise it works and has repeatedly cleared up this issue in the
minds of many students (and profs).
(1) Draw a fairly large circle one a piece of paper. This represents the
path of the floor of the space station.