A box sitting on a flat surface has a coefficient of static friction of s =
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A box sitting on a flat surface has a coefficient of static friction of μs = 0.3. If one end of the surface is raised, static friction prevents the box from sliding until the force of static friction is overcome. The critical angle at which the box begins to slide, θc, can be found from the equation tan θc= μs.
(a) What is the critical angle for the box?
(b) If the box is 5ft from the pivot point, at what height will the box begin to slide? See the figure.
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