Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

One-half of the total height above base
One-third of the total height above base
One-fourth of the total height above base
Three-eighth of the total height above the base

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Remain horizontal
None of these
Slant down towards direction of pull
Slant up towards direction of pull

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