en>Gwideman: /* Horse saddle */

2014-04-26T05:28:22Z

Horse saddle

en>Ammodramus: Fix first-person expressions: "we can see..."

2014-02-01T17:53:45Z

Fix first-person expressions: "we can see..."

← Older revision		Revision as of 19:53, 1 February 2014
Line 1:		Line 1:
			{{distinguish\|Circular motion}}
			{{merge to\|Angular speed\|date=September 2013}}
			{{refimprove\|date=December 2012}}
			{{Infobox Physical quantity
			\|bgcolour=
			\|name=Rotational speed
			\|image=
			\|caption=
			\|unit=[[hertz]]
			\|symbols=ω ([[omega]])
			\|derivations={{nowrap\|ω {{=}} [[Speed#Tangential speed\|v]] / [[Rotation around a fixed axis\|r]]}}
			}}
			{{Classical mechanics\|cTopic=Fundamental concepts}}
			'''Rotational speed''' (sometimes called '''speed of revolution''') is the number of complete rotations, revolutions, cycles, or turns per time unit. Rotational speed is a cyclic [[frequency]], measured in [[radians per second]] or in [[hertz]] in the [[International System of Units\|SI System]] by scientists, or in [[revolutions per minute]] (rpm or min<sup>-1</sup>) or [[revolutions per second]] in everyday life. The symbol for rotational speed is ω (the [[Greek alphabet\|Greek]] lowercase letter "omega").

			When proper units are used for [[Speed#Tangential speed\|tangential speed]] ''v'', rotational speed ω, and radial distance ''r'', the direct proportion of ''v'' to both ''r'' and ω becomes the exact equation:<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/rotq.html</ref>

	~~The author is known by~~ the ~~name~~ of ~~Kyoko and she completely enjoys this name~~. ~~South Carolina has usually been his living location but his spouse wants them~~ to ~~move. One~~ of the [~~http://Www.twitpic.com/tag/extremely extremely~~] ~~best issues in~~ the ~~globe~~ for me is ~~bottle tops gathering~~ but ~~I'm considering on starting something new~~. ~~Taking care of animals~~ is ~~how he supports his family members but soon his spouse and him will begin their own company~~. ~~If you want~~ to ~~find out more verify out my web site~~: ~~http~~://~~bigbook.eb2a.com/index.php?do~~=/~~blog~~/~~9381~~/~~hammocks-swings-for-your-backyard~~/<br><br>~~my page;~~ [~~http:~~//~~bigbook~~.~~eb2a.com/index~~.~~php?do=/blog/9381/hammocks~~-~~swings-for~~-your~~-backyard/ adjustable folding camping cot~~]		:<math>v = r\omega_{rad}</math>

			An algebraic rearrangement of this equation allows us to solve for rotational speed:

			:<math>\omega_{rad} = v/r</math>

			Thus, the tangential speed will be directly proportional to ''r'' when all parts of a system simultaneously have the same ω, as for a wheel, disk, or rigid wand. It is important to note that the direct proportionality of ''v'' to ''r'' is not valid for the [[planet]]s, because the planets have different rotational speeds (ω).

			Rotational speed can measure, for example, how fast a motor is running. Rotational speed and [[angular speed]] are sometimes used as synonyms, but typically they are measured with a different unit. Angular speed, however, tells the change in [[angle]] per time unit, which is measured in [[radian per second\|radians per second]] in the SI system. Since there are 2π radians per cycle, or 360 degrees per cycle, we can convert angular speed to rotational speed by:

			:<math>\omega_{cyc} = \omega_{rad}/2\pi\,</math>
			and
			:<math>\omega_{cyc} = \omega_{deg}/360\,</math>

			where
			* <math>\omega_{cyc}\,</math> is rotational speed in cycles per second
			* <math>\omega_{rad}\,</math> is angular speed in radians per second
			* <math>\omega_{deg}\,</math> is angular speed in degrees per second

			For example, a [[stepper motor]] might turn exactly one complete revolution each second.
			Its angular speed is 360 [[degree (angle)\|degrees]] per second (360°/s), or 2π [[radian]]s per second (2π rad/s), while the rotational speed is 60 rpm.

			Rotational speed is not to be confused with [[Speed#Tangential speed\|tangential speed]], despite some relation between the two concepts. Imagine a rotating merry-go-round. No matter how close or far you stand from the axis of rotation, your rotational speed will remain constant. However, your tangential speed does not remain constant. If you stand two meters from the axis of rotation, your tangential speed will be double the amount if you were standing only one meter from the axis of rotation.

			==See also==
			*[[Angular velocity]]
			*[[Orders of magnitude (angular velocity)]]

			==References==
			{{reflist}}

			{{DEFAULTSORT:Rotational Speed}}
			[[Category:Physical quantities]]

en>Paul White: /* Horse saddle */

2012-05-22T20:37:16Z

Horse saddle

New page

The author is known by the name of Kyoko and she completely enjoys this name. South Carolina has usually been his living location but his spouse wants them to move. One of the [http://Www.twitpic.com/tag/extremely extremely] best issues in the globe for me is bottle tops gathering but I'm considering on starting something new. Taking care of animals is how he supports his family members but soon his spouse and him will begin their own company. If you want to find out more verify out my web site: http://bigbook.eb2a.com/index.php?do=/blog/9381/hammocks-swings-for-your-backyard/<br><br>my page; [http://bigbook.eb2a.com/index.php?do=/blog/9381/hammocks-swings-for-your-backyard/ adjustable folding camping cot]

Monkey saddle - Revision history

en>Gwideman: /* Horse saddle */

en>Ammodramus: Fix first-person expressions: "we can see..."

en>Paul White: /* Horse saddle */