Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Sense of angular displacement
All of these
Direction of the axis of rotation
Magnitude of angular displacement

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Engineering Mechanics
The moment of a force

Is the turning effect produced by a force, on the body, on which it acts
All of these
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

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