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11-02-2022
Physics

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A coin placed on the cover of a book just begins to move when the cover makes an angle of 38 degrees with the horizontal. What is the coefficient of static friction?

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11-02-2022

Answer:

m g sin theta = force of object along incline due to gravity

N μ = frictional of incline on object where N is the normal force

N = m g cos theta force perpendicular to incline

m g sin theta = N μ = μ m g cos theta

μ = tan theta = tan 38 = .78

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