A block of mass 1.45 kg is resting on a board with friction.The board is inclined until the mass just starts to slide.  If the angle of the incline when the mass just barely begins to slide is 17.5 degrees, what is the coefficient of static friction between the block and the board?

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter5: Newton's Laws Of Motion
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A block of mass 1.45 kg is resting on a board with friction.The board is inclined until the mass just starts to slide.  If the angle of the incline when the mass just barely begins to slide is 17.5 degrees,
what is the coefficient of static friction between the block and the board? 

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