Applied Mechanics and Graphic Statics
Centre of gravity of a thin hollow cone lies on the axis of symmetry at a height of

One-fourth of the total height above base
None of these
One-half of the total height above base
One-third of the total height above base

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of the moments of the forces about a point must be zero
Algebraic sum of vertical components of all the forces must be zero
All (A), (B) and (C)

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