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2. Generalized coordinates - Wikipedia

   en.wikipedia.org/wiki/Generalized_coordinates

   This is a suitable choice of generalized coordinate for the system. Only one coordinate is needed instead of two, because the position of the bead can be parameterized by one number, s, and the constraint equation connects the two coordinates x and y; either one is determined from the other. The constraint force is the reaction force the wire ...

3. Cartesian coordinate system - Wikipedia

   en.wikipedia.org/wiki/Cartesian_coordinate_system

   A Cartesian coordinate system in two dimensions (also called a rectangular coordinate system or an orthogonal coordinate system [8]) is defined by an ordered pair of perpendicular lines (axes), a single unit of length for both axes, and an orientation for each axis. The point where the axes meet is taken as the origin for both, thus turning ...

4. Angle - Wikipedia

   en.wikipedia.org/wiki/Angle

   In Euclidean geometry, an angle or plane angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. [1] Two intersecting curves may also define an angle, which is the angle of the rays lying tangent to the respective curves at their point of intersection.

5. Polar coordinate system - Wikipedia

   en.wikipedia.org/wiki/Polar_coordinate_system

   Points in the polar coordinate system with pole O and polar axis L. In green, the point with radial coordinate 3 and angular coordinate 60 degrees or (3, 60°). In blue, the point (4, 210°). In mathematics, the polar coordinate system specifies a given point in a plane by using a distance and an angle as its two coordinates. These are

6. History of the metre - Wikipedia

   en.wikipedia.org/wiki/History_of_the_metre

   Borda was an avid supporter of decimalisation: he would insist that two different versions of the device be calibrated one in degrees and another in "grades" (1 ⁄ 100 of a quarter-circle), with 100 minutes to a grade and 100 seconds to a minute. [47] The repeating circle aimed at avoiding observational errors. The principe was to multiply the ...

7. Wikipedia:Reference desk/Archives/Science/December 2005 ...

   en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

   21.6 Converting Word document to PDF. 5 comments. 21.7 ... for my grade 12 biology class and I need to make a physical insulin structure. ... lens of focal length 20 ...