Angular velocity diagram
A vector diagram illustrating circular motion. The blue vector connects the origin (center) of the motion to the position of the particle. The red vector is the angular velocity vector, pointing perpendicular to the plane of motion and with magnitude equal to the instantaneous velocity.
Source
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"File:Angular velocity.svg - Wikipedia, the free encyclopedia."
http://en.wikipedia.org/w/index.php?title=File:Angular_velocity.svg&page=1
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