6(a) A regular octahedron form of twelve equal rods each of weight W freely jointed together...

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6(a) A regular octahedron form of twelve equal rods each of weight W freely jointed together is suspended W. from the one corner. Show that the thrust with each horizontal rod is 3 9 (b) A uniform hemispherical shell rest on a rough inclined plane whose angle of friction A. Show that inclination of the plane base to the horizontal cannot be greater than sin (2 sin ). 8 6(a) A regular octahedron form of twelve equal rods each of weight W freely jointed together is suspended W. from the one corner. Show that the thrust with each horizontal rod is 3 9 (b) A uniform hemispherical shell rest on a rough inclined plane whose angle of friction A. Show that inclination of the plane base to the horizontal cannot be greater than sin (2 sin ). 8