Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their algebraic sum is zero
Their lines of action are at equal distances

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Engineering Mechanics
The term 'Centroid' is

The same as centre of gravity
None of the listed here
The point of suspension
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Principle of conservation of energy
Newton's second law of motion
Newton's first law of motion
Principle of conservation of momentum

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