Applied Mechanics and Graphic Statics
The centre of gravity of a triangle is at the point where three

Bisectors of the angle of the triangle meet
Medians of the triangle meet
None of these
Perpendicular bisectors of the sides of the triangle meet

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Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
All of these
The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
The force of friction always acts in a direction opposite to that in which a body is moving

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