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

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

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
None of these

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