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You decide to find the coefficient of static friction between a paper cup and an archaic paper textbook. Armed with a metric ruler, you place the cup on the edge of the book, and raise the edge of the book until the cup starts to slide downwards. The length of the book is 26.0 cm, and you need to raise one edge 8.00 cm before the paper cup starts sliding. If the cup has a mass of 211 grams, what is the coefficient of static friction between the cup and the book?

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