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
Magnitude of angular displacement
All of these

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Engineering Mechanics
One joule means that

Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 N when it displaces a body through 1 m
Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m

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