There is a heap of sand... coefficient of friction is r... what is the maximum slope of the heap?
some
thing like this... or may be height.. i think same difference... u know one u know both
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2 Answers
33Consider a particle of mass m on heap forces on it normal reaction=mg*cosθ, frictional force along incline upwards = μ N =μ*mg cosθ. Now for equilibrium mg*sinθ(due 2 gravity downward along incline)= μ*mg*cosθ(along up plane).
therefore μ=tanθ or θ=tan-1μ.