You Find a Coin Resting on Your Physics Book Cover

You find a coin resting on your physics book cover and notice that when you open the cover,the coin slips exactly when the cover reaches 25 degrees above the horizontal.What is the coefficient of friction between the coin and book cover?

A) 0.20
B) 0.23
C) 0.37
D) 0.47
E) The question cannot be answered without knowing the coin's mass.

Correct Answer:

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