Talk:Orders of magnitude (speed)

message: Your listed speed for the maximum a human sprinter would go (11.80 m/s) corresponds to running an ~8.47s 100m race, this is more than a second faster than the world record (Set today, btw at 9.72 5/30/08)  Do you mean that the racers "peak" at this speed during the race? or do you mean that this is supposed to be the fastest humans can run 100m?    —Preceding unsigned comment added by 70.223.81.19 (talk) 08:28, 1 June 2008 (UTC)
replies: text: As a peak speed, I don't think it's that far off: this page claims that the fastest runners can maintain an avererage speed of 72km/h over a mile, with standing start. AxelBoldt 19:49, 27 May 2005 (UTC)

text: I fixed that using this as a source. --Vedranf 18:10, 17 December 2005 (UTC)
thread_title:  Human sprinter speed on table 

message: I suggest changing the representation of the units to m/s and km/h instead of using −1 for the time.  This is an equally precise, and I think more natural, representation. —Doug Bell talk•contrib 18:44, 6 April 2006 (UTC)
replies: text: I entirely agree, it took me a several minutes to work out that m·s−1 is the same as m/s. It wouldn't take away anything from the accuracy of the table to have m/s and km/h, and it would be Much easier to understand.--Hibernian 14:37, 16 August 2006 (UTC)
thread_title:  m·s<sup>−1</sup> and km·h<sup>−1</sup> 

message: Would it be appropriate to link to Hypervelocity from one of the entries?  Somewhere around StarDust? Shenme 03:54, 3 July 2006 (UTC)
thread_title:  [[Hypervelocity]] 

message: I noticed this:
0.0468 (m/s) 	0.013 (km/h)	Speed of a Garden snail [1].
Now the conversion is obviously wrong; it looks backwards. I don't know which is correct, but perhaps somebody who knows could edit it? Alex Klotz 19:53, 8 August 2006 (UTC)
replies: text:  Speed of garden snail now uses correct ratio of m/s to hm/h.  Also, reference for speed is given. Az7997 18:41, 23 October 2006 (UTC)
replies: text:  The snail article gives 1mm/s (with a reference), not 1cm/s as here.  Anyone explain this? Robinh (talk) 11:50, 31 March 2009 (UTC)
thread_title:  snail 

message: It seems a bit daft to me to have a m/s + km/h table, a m/s table, a mph table, then a km/h table, many sharing information.  I'll combine these the next time I have a spare moment if there is no discord.  Atropos235 05:09, 20 February 2007 (UTC)
replies: text: I fully support this. As the parent message 4+ years ago, would anyone object? cmɢʟee☺τaʟκ  16:56, 22 May 2011 (UTC)
replies: text: Done! cmɢʟee☺τaʟκ  23:11, 2 August 2011 (UTC)
thread_title:  Combine tables 

message: The speed of light is 299,792,458 (m/s) and not 299,792.458 (m/s). It's about 300 000 km/s and not 300 km/s.
Other values are wrong as someone used again a "." where there should be a ",".
Guelao 15:03, 7 August 2007 (UTC)
thread_title:  The speed of light is mistakenly expressed 

message: (Special?) Relativity only states that no INFORMATION may travel faster than light. It is I think possible for, e.g, the distance between two objects, for example our own galaxy and a sufficiently distant one, to be increasing at a rate faster than the speed of light due to the expansion of the universe. This means that light emitted 'now' from the distant galaxy can never reach us. I think. It's been a while since I studied relativity. 86.21.227.237 (talk) 21:50, 23 July 2008 (UTC)
thread_title:  Anything faster than light? 

message: Shouldn't it be there as an example? There is one that can reach 'bout 41 knots, dunno know if any other submarine is fasterUndead Herle King (talk) 04:32, 26 August 2009 (UTC)
thread_title: Fastest submarine?

message: The speed of the X-43 quoted in the entry:
7,111	25,599.6	Speed of the X-43 rocket/scramjet plane.
...is wrong.  Correct speed given here:
http://en.wikipedia.org/wiki/X-43  —Preceding unsigned comment added by 70.181.138.57 (talk) 04:58, 3 October 2010 (UTC)
thread_title: X-43 incorrectly listed

message: According to the table, the average speed of the (human?) hair growth is 1.7×10-8 m/s, but that means, from Google Calculator (http://www.google.ro/search?q=1.7*10^-8%20m/s%20in%20cm/year), about 53.6467742 cm/year, which is near impossible (or it is the maximum growth, or it is for an animal, or it is wrong), because at the article Human hair growth, it says: 'The rate or speed of hair growth is about 1.25 centimeters or 0.5 inches per month, or about 15 centimeters or 6 inches per year.' So, please resolve the problem! Or it is true? 78.97.152.14 (talk) 13:06, 29 August 2011 (UTC)
replies: text: I was going to check out the talk page but forgot about it ... I've already fixed that and added a caveat since it varies so much. Actually, it would probably be more honest to write something like in the case of continental drift: 1 to 1 m/s (etc.), as this seems to cover the typical range of growth rates found in the population. That doesn't mean that considerably more slowly or quickly growing hair doesn't exist; judging from what I've heard personal acquaintances report, I have reason to suspect it does very definitely – but those cases are most likely rare. --Florian Blaschke (talk) 22:27, 16 October 2011 (UTC)
thread_title:  Hair growth 

message: I think it would be nice to see a column showing the speed relative to the speed of light, since it is the natural maximum speed limit of the universe.
It would look something like this for an item:
Factor	| Value (m/s)	| Value (km/h)	| Value (mph)	| Value (c)	| Item
10^4 	| 29,800	| 107,280	| 66,700	| 9.9402X10^-5	| Speed of the Earth in orbit around the Sun.
:Do you have any rationale for its usefulness? I think it might be only for items a significant fraction (1+%?) of the speed of light — otherwise, very small numbers e.g. 1 just take up space. cmɢʟee୯ ͡° ̮د ͡° ੭ 19:45, 16 January 2013 (UTC)
thread_title:  Column for speed relative to c, the speed of light 

message: I don't know if it is true or not. It is said that Beta particles can exceed c (Speed of light in vacuum) when in water.  — Preceding unsigned comment added by 220.238.65.82 (talk) 12:54, 22 September 2013 (UTC)
thread_title:  Beta Particles in Water? 

message: I suggest and additional column using the most usual unit for each entry, expressed in layman number writing :
* m/day for glacier
* m/s and km/h for winds
* km/h for most ground vehicles
* km/h and knots for ships
* mach for fast airplanes
* % of c for relativistic speeds
* ...
Because few people can "get" things like 4.0×10−4 m/s. --Musaran (talk) 14:51, 24 July 2014 (UTC)
thread_title:  Layman column 

message: The circumferences of clocks vary very widely, from the wristwatch to the Big Ben of London.
So, I suggest that the speed of the tip of an hour hand be taken down from here.
It already has a place in the table for magnitude of angular velocities. Daimler Ben (talk) 13:13, 15 November 2016 (UTC)
replies: text: Noted it's for a 7 cm hand as v = r ω = 0.07 m ·  . The linear speed is useful as comparison with other slow objects. Cheers, cmɢʟee⎆τaʟκ 18:35, 11 August 2017 (UTC)
thread_title:  Speed of the tip of an hour hand? 

message: 828,000 km/h. I am not smart enough to add myself, as my attempts cause more destruction than improvment.
:Already listed as "Orbital speed of the solar system in the Milky Way galaxy." Cheers, cmɢʟee⎆τaʟκ 18:37, 11 August 2017 (UTC)
thread_title:  Speed of Sun in the Milky Way 

message: This can't be right, can it? Nothing on the rocket ship wiki page, and google searching the MPH value shows the speed of solar wind. No rocket ship has gotten close to a tenth of c... Going to remove in a couple days, or switch to solar wind.
		
M/s    	km/h     	mph    	%c    	thing
400,000	1,400,000	895,000	0.0012	Speed of an average rocket ship.
Gdryke (talk) 16:18, 30 August 2018 (UTC)
thread_title:  Speed of rocket ship, way too high? 

message: A reader contacted Wikimedia to note that the entry for the
Speed of the 7 TeV protons in the Large Hadron Collider at full power
In miles per hour, shown as
670,615,282
is incorrect and should be
 
670,616,623.9 mph
Can someone double check the values?--S Philbrick(Talk) 13:54, 10 September 2017 (UTC)
thread_title:  Speed of the 7 TeV protons in the Large Hadron Collider at full power 

message: Where did the average speed of a car come from? 80 MPH seems a bit high. EdHayes3 (talk) 19:59, 9 January 2019 (UTC)
thread_title:  Average speed of car