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A worker wishes to pile a cone of sand into a circular area in his yard. The radius of the circle is rand no sand is to spill onto the sorrounding area.if u(mu) is the coffecient of static friction between each layer of sand along the slope and the sand,the greatest volume of sand that can be stored in this manner is (a)u pi r^3 (b)1/3u pi r^3 (c)2u pi r^2 (d)2u pi r
b is the correct option.
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