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Old 2011-03-08, 15:36   #23
science_man_88
 
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Quote:
Originally Posted by ET_ View Post
He gave 3 decimals. I multiplied it by 3.6 (another decimal) so I came up with 4-decimal accuracy...

Luigi
someone needs to read up on significant digits his estimate had at most 5 digits accuracy regardless of what you multiply it by you can only as many digits as your least amount of significant digits in a operand so in this case even if you use a multiplier that has 10 digits in it , you can only get accuracy to 5 digits your answer has a total of 7 that I count so only the first 5 count. only thing that could get you off that hook is http://en.wikipedia.org/wiki/Signifi...uous_precision, which in my opinion devalues all results.

Last fiddled with by science_man_88 on 2011-03-08 at 15:41
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Old 2011-03-08, 15:41   #24
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Quote:
Originally Posted by science_man_88 View Post
someone needs to read up on significant digits his estimate had at most 5 digits accuracy regardless of what you multiply it by you can only as many digits as your least amount of significant digits in a operand so in this case even if you use a multiplier that has 10 digits in it , you can only get accuracy to 5 digits your answer has a total of 7 that I count so only the first 5 count.
You speak like an engineer, not like a mathematician...

And 3.14 is viable for most computations.

Luigi
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Old 2011-03-08, 15:58   #25
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Quote:
Originally Posted by ET_ View Post
You speak like an engineer, not like a mathematician...

And 3.14 is viable for most computations.

Luigi
Considering I'm neither that's a compliment.
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Old 2011-03-08, 17:09   #26
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Quote:
Originally Posted by science_man_88 View Post
Considering I'm neither that's a compliment.
It really was

I liked your way of explaining your concepts.

Luigi
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Old 2011-03-08, 17:14   #27
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Quote:
Originally Posted by EdH View Post
Fourth wouldn't have had enough room with red line at 5000, unfortunately. The gearing just didn't seem quite right. I needed a gear right in between - 4.5?
I was thingin if the car had a rev limit higher than that it would be better. Oh well it was worth a try.
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Old 2011-03-10, 12:05   #28
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Driving: 220 Km/h on a Opel Astra GSi
As passenger: don´t quite remember, probably just about the same.
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Old 2011-03-10, 16:39   #29
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About 135mph in a Toyota Supra Turbo on the backroads of northwestern Mississippi - for only a short burst. My 'to-be' wife was in the passenger seat, and the look on her face was 'priceless' . But, that was at a much younger age, well back into the last century. I have 'matured' since then and wised up a bit.

As most of you probably already know, the ability to get to speeds like these is not so much the capability of your auto, but rather finding roads smooth enough to allow you to do it. Even most interstates are not that consistently smooth.
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Old 2011-03-11, 00:38   #30
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A while back a relative and I worked indirectly (a temporary worker for a contractor) and briefly for a person that drove a wheel driven car over 400 mph (their name is on the top list here: http://spectreperformance.com/blog/2...e-400mph-list/). At the same time a future spouse of another relative worked directly with and for the same individual.

Just a 6 degrees thing.
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Old 2011-03-11, 16:43   #31
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Quote:
Originally Posted by FactorEyes View Post
I broke 600 mph in a passenger jet.
I've been over 800 mph (ground speed) on a 747, either to or from Florida, can't remember which.

Driving, alas only around 75 mph, but I've been driven at 100 - 105 mph by an outwardly normal guy who apparently just didn't see the point of travelling at speeds where the car wasn't trying to shake itself apart.

Forget significant figures, give the proper uncertainties (preferably to an infinite number of decimal places)!
173 ± 0.5 mph ==> 77.33792 ± 0.22352 m/s
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Old 2011-03-11, 17:41   #32
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Quote:
Originally Posted by lavalamp View Post
I've been over 800 mph (ground speed) on a 747, either to or from Florida, can't remember which.
You must have benefited from a seriously freakish tail wind. What was the turbulence like?
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Old 2011-03-11, 18:46   #33
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800 mph is above the speed of sound unless the temperature is above 45 degree C (113 F) which it isn't that high up, and I doubt any 747 broke the sound barrier.

http://en.wikipedia.org/wiki/Speed_of_sound

Last fiddled with by ATH on 2011-03-11 at 18:47
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