Rotation in three dimensions | Spherical trigonometry | Quaternions
In mathematics, a versor is a quaternion of norm one (a unit quaternion). The word is derived from Latin versare = "to turn" with the suffix -or forming a noun from the verb (i.e. versor = "the turner"). It was introduced by William Rowan Hamilton in the context of his quaternion theory. Each versor has the form where the r2 = −1 condition means that r is a unit-length vector quaternion (or that the first component of r is zero, and the last three components of r are a unit vector in 3 dimensions). The corresponding 3-dimensional rotation has the angle 2a about the axis r in axis–angle representation. In case a = π/2 (a right angle), then , and the resulting unit vector is termed a right versor. (Wikipedia).
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From playlist MWRC 2009
http://www.mekanizmalar.com A wobbler is usually the first type engine made by small engine builders. The wobbler does not need tiny moving valves which makes manufacturing simple.
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From playlist Unboxing / Product Reviews
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From playlist Geogebra
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From playlist Physics - Light and Optics
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From playlist desmos
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From playlist Physics - Light and Optics
If you are interested in learning more about this topic, please visit http://www.gcflearnfree.org/ to view the entire tutorial on our website. It includes instructional text, informational graphics, examples, and even interactives for you to practice and apply what you've learned.
From playlist 3D Printing
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From playlist Plenary Lectures