What is the coefficient of static friction between a coin and a tilted book?

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To determine the coefficient of static friction (μs) between a coin and a tilted book, the problem involves a coin at rest on a book inclined at an angle θ. When the angle is increased to 13 degrees, the coin is on the verge of sliding, indicating that the forces acting on the coin are balanced at this angle. The weight of the coin can be resolved into components: one perpendicular to the surface (normal force) and one parallel, which attempts to cause sliding. The force of static friction opposes this sliding force and is proportional to the normal force. Thus, the coefficient of static friction can be calculated using the relationship between these forces at the critical angle of 13 degrees.
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Homework Statement



A coin of mass m is at rest on a book that has been tilted at an angle θ with the horizontal. By experimenting, you find that when θ is increased to 13o, the coin is on the verge of sliding down the book, which means that even a slight increase beyond 13o produces sliding. What is the coefficient of static friction μs between the coin and the book?

Homework Equations



F=ma, f(static friction) = (μ)*normal force

The Attempt at a Solution



I drew out the problem, but from here I am sort of lost.
 
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The weight of the coin is a force downwards, right? Rewrite that force as the sum of a force perpendicular (normal) to the surface of the book and parallel to the surface of the book. The parallel force is trying to make the coin slide; it's opposed by the force of friction, which is related to the normal force.
 
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