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

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

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Engineering Mechanics
The static friction

All of these
Bears a constant ratio to the normal reaction between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
Is independent of the area of contact, between the two surfaces

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