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Topic: Rotation

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In the News (Mon 22 Apr 19)

  Rotation - Wikipedia, the free encyclopedia
Rotation is the movement of an object in a circular motion.
This is a consequence of Euler's rotation theorem.
In astronomy, rotation is a commonly observed phenomenon.
en.wikipedia.org /wiki/Rotation   (994 words)

 Galaxy rotation curve - Wikipedia, the free encyclopedia
Rotation curve of a typical spiral galaxy: predicted (A) and observed (B).
The rotation curve of a galaxy is a graph that plots the orbital velocity of the stars or gas in the galaxy on the y-axis against the distance from the center of the galaxy on the x-axis.
The galaxy rotation problem is this discrepancy between the observed rotation speeds of matter in the disk portions of spiral galaxies and the predictions of Newtonian dynamics considering the visible mass.
en.wikipedia.org /wiki/Rotation_curve   (1108 words)

 MF Bliki: Rotation
My sense is that geographic rotation will be one of our key techniques to avoid the company dividing into national fiefs.
One of the biggest difficulties in project rotation is that clients often don't like to lose known able people and get someone new and unproven.
Rotation is a practice which we've seen to promote knowledge transfer and reuse, and I think its efficacy is due to the fact that it addresses the human element.
www.martinfowler.com /bliki/Rotation.html   (553 words)

 Peanut Rotation Study
The highest yielding rotation was the two-year cotton-one-year peanut rotation, which increased yields by 311 pounds per acre (4,009 versus 3,698) compared with that of continual peanuts where Bravo + Folicur was used.
The highest yielding rotation was the two-year corn-one-year peanut, with yield increases of 574 pounds per acre (4,178 versus 3,604) compared with that of continual peanuts where Bravo + Folicur was used and 555 pounds per acre (3,647 versus 3,092) with the Bravo-only treatment.
A two-year corn-one-year peanut rotation increased yields by 217 pounds per acre (3,442 versus 3,225) compared with that of continual peanuts where Bravo alone was used and by 102 pounds per acre (3,668 versus 3,566) where Folicur was used.
www.noble.org /Ag/Research/Articles/PeanutRotation/Index.htm   (912 words)

 Deep Impact: Science: Tempel 1 - Rotation   (Site not responding. Last check: 2007-10-22)
We would like to use the rotation period to adjust the arrival time at the comet so that the largest possible lighted area of the comet's nucleus presents itself to the impactor at the time of encounter.
Should the rotation period not be known sufficiently well the arrival time will be determined by other considerations, such as the ability of the spacecraft to communicate to two stations simultaneously during the encounter and the aspect of the target at impact will be left to chance.
For scientific interpretation accuracy of the rotation period is not the primary consideration.
deepimpact.jpl.nasa.gov /science/tempel1-rotation.html   (497 words)

 Rotation   (Site not responding. Last check: 2007-10-22)
In pure rotation it remains in the vicinity of the axis of rotation and periodically returns to its original position.
I use the term "pure" rotation because it is possible that an object undergo both translation and rotation simultaneously.
If the object was not rotating on its own axis, as we view it from the reference frame origin it would appear to be rotating once per the period of its orbit around the origin.
www.mcasco.com /p1rot.html   (2736 words)

 Dogglife's Smilie Emporium- Help Files- Rotation
Here is a good example of effective rotation: Say that you are in the middle of animating a powerbomb and you desire to rotate the arm from the first frame about 60 degrees to the right for the next frame.
The least effective way to go about this is to complete the first rotation for the second frame, sharpen it, and then to use that rotated arm again to rotate 35 degrees for the thrid frame and resharpen the arm.
The more effective way would be to do the first rotation for the second image, sharpen the image, and then go back to the first image and rotate it 95 degrees (60 + 35) and sharpen it for the third frame.
www.geocities.com /dogglife315/help_guide/rotation_of_body_parts/rotation_home.html   (1646 words)

In that case, the angle of rotation is equal to 2[pi] radians.
In describing the rotation of a rigid body we have to choose a reference line with respect to which the angle of rotation is being measured.
To derive this equation we have assumed that for rotations around a fixed axis the distance r from point A to the rotation axis is constant (independent of time) which is true for a rigid body.
teacher.pas.rochester.edu /phy121/LectureNotes/Chapter11/Chapter11.html   (1837 words)

 US Attorney (EDNY) Rotation :: Touro Law Center
The rotation is designed to expose students in a highly structured way to a variety of practice skills and ethical issues, while giving them the opportunity to reflect on the lawyer's role both as an advisor and officer of the court.
Rotation students are assigned to either the civil or criminal division of the U.S. Attorney's Office for the Eastern District of New York, based at the federal courthouse in Central Islip, Long Island, the newest and the second largest in the country.
The rotation affords students the chance not only to work with highly skilled federal prosecutors and civil attorneys, but also to work in the most modern federal courthouse in the nation.
www.tourolaw.edu /academic_programs/juris_doctor_jd/clinics/us_attorney_edny_rotation.asp   (286 words)

 Rotation Curves   (Site not responding. Last check: 2007-10-22)
The rotation curve of a galaxy is the variation in the orbital circular velocity of stars or gas clouds at different distances from the center.
A flat rotation curve, that is, one in which the velocity is constant over some range of radii, implies that the mass is still increasing linearly with radius.
A flat rotation curve implies that the mass continues to increase linearly with radius.
astrosun.tn.cornell.edu /academics/courses/astro201/rotation_curves.htm   (195 words)

 Rotation   (Site not responding. Last check: 2007-10-22)
Rotation is used in Taekwondo techniques to generate force and increase the power of techniques.
Sometimes, near the end of a rotation, the shoulders may continue to rotate after the hips are stopped or when they reach their limit of rotation, such as with a spinning back fist.
Shoulder rotation adds to the speed of arm techniques, as well as increasing the overall rotational speed of the body.
tkdtutor.com /06Theory/Power/Rotation.htm   (1022 words)

 Rotation - An incredibly addictive game! Rotate the circles to match the position of balls shown in the picture.
Rotate the circles to match the position of balls shown in the picture.
The object is to rotate the circles and get the balls to match the one shown in the picture.
You can look at the picture after every move to see whether you made the correct move or not.
rotation.freeonlinegames.com   (115 words)

 Geometry Session 7, Part B: Rotation Symmetry
If you can rotate (or turn) a figure around a center point by fewer than 360° and the figure appears unchanged, then the figure has rotation symmetry.
The point around which you rotate is called the center of rotation, and the smallest angle you need to turn is called the angle of rotation.
As you will see in the next section, in order to have rotation symmetry, the center of rotation does not have to be the center of the figure.
www.learner.org /channel/courses/learningmath/geometry/session7/part_b/index.html   (296 words)

 Rotation Transform
Except for the trivial rotation through a zero angle which is identical, rotations have a single fixed point - the center of rotation.
However, all circles centered at the center of rotation are fixed.
Two rotations with a common center commute as a matter of course.
www.cut-the-knot.org /Curriculum/Geometry/Rotation.shtml   (263 words)

 Rotation Curves
By the same argument the flat galactic rotation curves seem to suggest that each galaxy is surrounded by significant amounts of dark matter.
The rotation speed is found not to decrease with increasing distance from the galactic center, implying that the mass distribution of the galaxy cannot be concentrated, like the light distribution.
The mass must continue to increase: since the rotation speed satisfies v^2=GM/r, where M is the mass within radius r, we infer that M increases proportionally to r.
astro.berkeley.edu /~mwhite/darkmatter/rotcurve.html   (938 words)

 Stock rotation at Trade10.com- The science of trading market momentum for stocks, options, futures and bonds.
Evidence of sector rotation can be found in daily market activity when one group of stocks outperforms the market while another under performs.
Evidence of sector rotation can also be seen in the longer term trends of various indices.
Sometimes rotation can be the result of an expectation of earnings or brighter outlook, or could be the result of rebalancing of portfolios.
www.trade10.com /rotation.htm   (693 words)

 Rotation Matrix
Vector rotation is equivalent to the axis rotation in the opposite direction.
One should not be confused by the axis rotation and the vector rotation.
In vector transformation, the axis rotation matrices should be used instead of the vector rotation matrices because vector transformation means change in the perspective.
kwon3d.com /theory/transform/rot.html   (205 words)

 Saturn's rotation puts astronomers in a spin - space - 03 May 2006 - New Scientist Space
The most commonly cited figure for Saturn’s rotation period — 10 hours, 39 minutes and 22.4 seconds — was derived in 1980 from Voyager observations of radio waves generated by solar radiation hitting the planet’s atmosphere.
If the signal is indeed tied to the rotation of the planet’s solid core, as the Cassini team proposes, it is not clear how this can be reconciled with the earlier Voyager measurement.
The wobble creates a strong periodic signal in Jupiter’s magnetic field which is a reliable indicator of the planet’s rotation speed.
www.newscientistspace.com /article/dn9100-saturns-rotation-puts-astronomers-in-a-spin.html   (622 words)

 Rotation Attribute (Shape)(VML)   (Site not responding. Last check: 2007-10-22)
Note that the shape is repositioned after the rotation to reflect the new bounding box coordinates.
Also note that for scripting, the style attribute is not used and that Rotation is treated as a direct attribute of the shape.
The Rotation attribute is similar to the standard HTML Rotation attribute for styles.
msdn.microsoft.com /workshop/author/vml/shape/a_rotatn.asp   (102 words)

 regions endocrinology rotation - Medicine Residency Program - the University of Minnesota
The rotation is set up so that residents see each patient independently and then patients are staffed with the attending endocrinologist.
The Faculty physician is responsible for overseeing care of all patients on this rotation.
The core lecture series was devised to compliment the endocrine rotation objectives for Internal Medicine residents.
www.med.umn.edu /medres/program/rotations/regionsendo.html   (835 words)

 An Intuitive Notion of Rotations   (Site not responding. Last check: 2007-10-22)
The leaf on this plant illustrates the concept of a rotation.
The center of rotation is the point where the leaf is attached to the stem.
The concept of rotations can be seen in wallpaper designs and art work.
regentsprep.org /regents/math/rotate/Lrotate.htm   (112 words)

 USATODAY.com - Pentagon announces new troop rotation extends to '08   (Site not responding. Last check: 2007-10-22)
WASHINGTON (AP) — The Pentagon on Monday announced a troop rotation for Iraq that will stretch through 2008 and be substantially smaller than the current force, but officials said additional units may be added.
The troop rotation announcement identified only six combat brigades, including one from the National Guard, that will deploy over a two-year period beginning in mid-2006.
Rumsfeld, appearing before reporters with British Defense Minister John Reid before the troop rotation details were announced, stressed that conditions on the ground in the months ahead will determine any changes in U.S. force levels.
www.usatoday.com /news/washington/2005-11-07-troop-rotation_x.htm   (572 words)

 Workshop Rotation Model Homepage
Rotation churches and individuals across the country who have volunteered to help churches in their region learn more about the Model.
Rotation.org is a volunteer created not-for-profit site sponsored by Workshop Rotation churches and individuals who believe in freely sharing their ideas, enthusiasm and lesson materials with others.
The names "Workshop Rotation Model, "Workshop Rotation," and "Rotation Model" and the Rotation logo are trademarked.
www.rotation.org   (591 words)

 Math Forum: Rotation Tessellation Instructions in Color
Type 90 (in the box indicating the number of degrees to be rotated).
Select the second (rotated) squiggle and, again holding the option key, drag from it to make a third squiggle.
The Math Forum is a research and educational enterprise of the Drexel School of Education.
mathforum.org /sum95/suzanne/colorrotation.html   (263 words)

If two vectors are simultaneously rotated about the origin, the rotation formula and Pythagorean relationship show that their dot product remains unchanged.
Uniform circular motion is characterized by a relationship between velocity and position: The velocity vector is given by rotating the position vector one quarter of a circle (counterclockwise by convention.) This is either written
In three dimensions, we may use plane rotations to simultaneously rotate three vectors so that all but the first component of the first vector is zero
www.math.utah.edu /~palais/bob/Rotation/Rotation.html   (379 words)

 NASA - Scientists Find That Saturn's Rotation Period is a Puzzle
Here's the puzzle: That is about 6 minutes, or one percent, longer than the radio rotational period measured by the Voyager 1 and Voyager 2 spacecraft, which flew by Saturn in 1980 and 1981.
The radio sounds of Saturn's rotation, which are also the first sounds from Saturn studied by Cassini, are like a heartbeat and can be heard by visiting http://www.jpl.nasa.gov/videos/cassini/0604/ and http://www-pw.physics.uiowa.edu/space-audio
It demonstrates that the idea of a rigidly rotating magnetic field is wrong," said Dr. Alex Dessler, a senior research scientist at the University of Arizona, Tucson.
www.nasa.gov /mission_pages/cassini/media/cassini-062804.html   (825 words)

 Solar Rotation   (Site not responding. Last check: 2007-10-22)
This rotation was first detected by observing the motion of sunspots as shown in the animation to the left.
The Sun's rotation axis is tilted by about 7.25 degrees from the axis of the Earth's orbit so we see more of the Sun's north pole in September of each year and more of its south pole in March.
The source of this "differential rotation" is an area of current research in solar astronomy.
solarscience.msfc.nasa.gov /sunturn.shtml   (228 words)

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