Question: A very thin bookmark having a width a. is in the middle of a dictionary of weight W. If the pages are b by c,

A very thin bookmark having a width a. is in the middle of a dictionary of weight W. If the pages are b by c, determine the force P needed to start to pull the bookmark out. The coefficient of static friction between the bookmark and the paper is μs. Assume the pressure on each page and the bookmark is uniform.

Given:

a = 1 in

W = 10 lb

b = 8 in

c = 10 in

μs = 0.7

A very thin bookmark having a width a. is in the middle of a

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