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

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Engineering Mechanics
Angle of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction
The ratio of minimum friction force to friction force acting when the body is in motion
Ratio of limiting friction and normal reaction
The ratio of minimum friction force to the friction force acting when the body is just about to move

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