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Hoser
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Bolt is insanely fast

Sun Aug 16, 2009 3:58 pm

Just heard that Usain Bolt just set another WR in the 100m............9.58 seconds! :o

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Nitrodist
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Re: Bolt is insanely fast

Sun Aug 16, 2009 4:22 pm

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Krogoth
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Re: Bolt is insanely fast

Sun Aug 16, 2009 4:38 pm

I did some simple calculations.

He was sprinting at 23MPHs. For those who prefer the metric system, he was going 37.5 KPH. That is incredibly fast for a human. :o
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Re: Bolt is insanely fast

Sun Aug 16, 2009 5:03 pm

Krogoth wrote:
I did some simple calculations.

He was sprinting at 23MPHs. For those who prefer the metric system, he was going 37.5 KPH. That is incredibly fast for a human. :o

But it gets better — that was his average speed! Remember the gun went off and then he started accelerating from 0mph.
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Pettytheft
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Re: Bolt is insanely fast

Sun Aug 16, 2009 5:04 pm

Krogoth wrote:
I did some simple calculations.

He was sprinting at 23MPHs. For those who prefer the metric system, he was going 37.5 KPH. That is incredibly fast for a human. :o


Who knows what his top speed was.
 
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Re: Bolt is insanely fast

Sun Aug 16, 2009 8:09 pm

Pettytheft wrote:
Krogoth wrote:
I did some simple calculations.

He was sprinting at 23MPHs. For those who prefer the metric system, he was going 37.5 KPH. That is incredibly fast for a human. :o


Who knows what his top speed was.

It couldn't be more than 27-30 MPH. That is the limit that muscles in the human legs can handle.
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Re: Bolt is insanely fast

Sun Aug 16, 2009 8:37 pm

He truly is in a league of his own. No one is even close to him right now. He's only 22 years old as well. Carl Lewis set his fastest time at 26 years old. While Bolt might not continue to improve like that it does leave one to imagine a sub 9.5 time in Bolt's career is a real possibility.
 
JustAnEngineer
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Re: Bolt is insanely fast

Sun Aug 16, 2009 8:41 pm

If he accelerated at 5 m/s² for the first 15 meters, then maintained his speed for the remaining 85 meters, he'd be at 12 m/s (43.2 km/hr or 26.8 mph) for most of the way. If he accelerated at 6.6 m/s² to reach top speed in 10 meters, he'd only have to run at 11½ m/s (41.4 km/hr or 25.7 mph) the rest of the way.
 
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Re: Bolt is insanely fast

Sun Aug 16, 2009 8:54 pm

that freak can fly!!!

watched the ESPN commentary on this and the 'expert' mentioned that Bolt was running just shy of 30 mph when he crossed the finish line...

http://espn.go.com/video/clip?id=4402903
 
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Re: Bolt is insanely fast

Sun Aug 16, 2009 10:21 pm

Krogoth wrote:
It couldn't be more than 27-30 MPH. That is the limit that muscles in the human legs can handle.

Yeah, just like it's impossible for a human being to run a 4:00 mile.

I have no idea, myself, but it sure sounds the same.
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Re: Bolt is insanely fast

Mon Aug 17, 2009 12:20 am

Yeah, I saw a claim that he hit 48kph/30mph at his peak; given that we have high-speed "film" of the entire race it should be pretty straight-forward to work out his instananeous velocity on a per-30th-of-a-second basis or less (half of whatever the framerate was).

One delicious historical footnote was that this race was run in the same stadium where Jesse Owens ran in the 1936 Olympics. Yes, Adolf, there is an Übermensch.... and he's still not your idea of "aryan" in the least.
 
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Re: Bolt is insanely fast

Mon Aug 17, 2009 9:24 am

Did some calculations there:

Assuming he had uniform acceleration (i know he didnt, but just for arguments sake)

v = u +at
v = 0 + 9.58a -> v = 9.58a

u is the initial velocity.
v is the velocity at the end.
a is the acceleration.
-----------------------------------------
s = vt - 1/2(a)(t^2)
100 = 9.58v - 45.89a
100 = 91.78a - 45.89a
a = 100/45.8864
a = 2.179 m/s^2

s is the distance
v is final velocity
t is time
a is acceleration
------------------------------
v is then equal to 20.88 m/s.

This is assuming constant acceleration which is unrealistic in real life!!
also, 20.88 m/s is 46.707 mph or 75.168 km/hr
Last edited by wobbles-grogan on Wed Aug 19, 2009 8:02 am, edited 1 time in total.
 
Hawkwing74
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Re: Bolt is insanely fast

Mon Aug 17, 2009 1:15 pm

Wow he is amazing. What's also interesting to me is that Tyson Gay ran a 9.71 in the same race which would have barely been the WR had not Bolt run like he did.

Edit. Wikipedia misled me. Bolt ran 9.69 at the Olympics so Gay set a personal best, not the 2nd best time ran.
 
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Re: Bolt is insanely fast

Mon Aug 17, 2009 6:17 pm

Hawkwing74 wrote:
Wow he is amazing. What's also interesting to me is that Tyson Gay ran a 9.71 in the same race which would have barely been the WR had not Bolt run like he did.

Edit. Wikipedia misled me. Bolt ran 9.69 at the Olympics so Gay set a personal best, not the 2nd best time ran.

I think that still serves to show how fast Bolt ran. His biggest rival, Gay, ran as fast as he possibly could, and he still couldn't come close.
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Re: Bolt is insanely fast

Mon Aug 17, 2009 10:14 pm

The most amazing part of this record is by how much better he did. This wasn't a 0.01 second improvement.
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Re: Bolt is insanely fast

Tue Aug 18, 2009 12:35 pm

The dude is the most amazing sprinter ever in all of recorded history.
It sure is something special to witness. Nobody has done or does what he does, like he does it.
It's really quite a spectacle! I wonder if we will start to see more tall sprinters like Bolt in the future.
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 12:36 pm

Jesus Christ. That man is fast.
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 4:35 pm

Krogoth wrote:
It couldn't be more than 27-30 MPH. That is the limit that muscles in the human legs can handle.
Do you have a source for that opinion? Because according to at least one biomechanics/physiology professor Bolt is still not close to the absolute human limit. (This guy thinks a flat 9 seconds is possible, which seems hard to believe, but I didn't think what Bolt did this weekend was possible either). Bolt himself thinks he can do 9.4; I wouldn't be surprised if he says that because he's already run that fast in practice. And research done after his victory in Beijing last year (when he famously started celebrating rather than finishing the race full tilt) agrees.
FroBozz_Inc wrote:
I wonder if we will start to see more tall sprinters like Bolt in the future.
That first article points out that being tall negatively affects accelerations so it is a disadvantage to being a sprinter (and an advantage for the longer distances) which is why he is such a freak of nature. I wonder if he has more fast-twitch muscles in his legs than ordinary humans (kind of like how Lance Armstrong has the lungs and heart of a much larger person).
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 5:24 pm

UberGerbil wrote:
That first article points out that being tall negatively affects accelerations so it is a disadvantage to being a sprinter (and an advantage for the longer distances)
I disagree with the sentence about stride length in the npr article. The best middle and long distance male runners (i.e., 800m and longer) are rarely taller than 5'9" (one source is wikirun.com). I trust the Peter Weyand quotes, but not when that author condenses the other facts in to a few sentences.
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 5:28 pm

wibeasley wrote:
UberGerbil wrote:
That first article points out that being tall negatively affects accelerations so it is a disadvantage to being a sprinter (and an advantage for the longer distances)
I disagree with the sentence about stride length in the npr article. The best middle and long distance male runners (i.e., 800m and longer) are rarely taller than 5'9" (one source is wikirun.com). I trust the Peter Weyand quotes, but not when that author condenses the other facts in to a few sentences.
The audio interview with him is available as a link at the top of the article, but I don't believe he gets into stride lengths at all -- just generalization about height vs race distances. Of course he might have and that got edited out of the audio interview also.
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 6:09 pm

SNM wrote:
Krogoth wrote:
It couldn't be more than 27-30 MPH. That is the limit that muscles in the human legs can handle.

Yeah, just like it's impossible for a human being to run a 4:00 mile.

I have no idea, myself, but it sure sounds the same.


that exactly what I was thinking when I read Krogoth's comment.
Does anyone else have an over-riding sense of naivety when they say things like that? As soon as it comes out I'm usually thinking of the flat-world people, the 640K of memory people, the four minute mile people.

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Re: Bolt is insanely fast

Tue Aug 18, 2009 9:02 pm

UberGerbil wrote:
The audio interview with him is available as a link at the top of the article.
I'm backing off my objections. I didn't realize the conversation was only about short distances.
 
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Re: Bolt is insanely fast

Tue Aug 18, 2009 10:43 pm

When he broke the world record in the 200 last year it was simply amazing. The video of him coming around the turn at that speed sent chills up my spine. Possibly the only sports title greater than "Fastest Man in the World", is "Undisputed Heavyweight Champion of the World". That's debateable though, I guess.
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SNM
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Re: Bolt is insanely fast

Wed Aug 19, 2009 12:28 am

RickyTick wrote:
When he broke the world record in the 200 last year it was simply amazing. The video of him coming around the turn at that speed sent chills up my spine. Possibly the only sports title greater than "Fastest Man in the World", is "Undisputed Heavyweight Champion of the World". That's debateable though, I guess.

As an ex-distance runner, I have to protest. Fastest Man definitely beats out Undisputed whatevermaboxingthingy. But just because "fastest man" has the simplest title doesn't make it the best; milers are way cooler. They go so much farther and yet compared to how fast you or I can run it's essentially the same speed as Bolt is! :P
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Re: Bolt is insanely fast

Thu Aug 20, 2009 1:44 pm

BOLT'S DONE IT AGAIN...

200m world record time of 19.19s just now in the world championships....
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Re: Bolt is insanely fast

Thu Aug 20, 2009 1:55 pm

KeillRandor wrote:
BOLT'S DONE IT AGAIN...

200m world record time of 19.19s just now in the world championships....

Holy crap! That's amazing.
 
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Re: Bolt is insanely fast

Thu Aug 20, 2009 2:15 pm

Did you expect anything less? Whenever Bolt runs the 100m he's always pulling away more and more at the end. It's only natural that he be even more dominate in the 200m.
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Re: Bolt is insanely fast

Thu Aug 20, 2009 3:47 pm

PerfectCr wrote:
He was great in the Disney movie.



I lol'd
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Re: Bolt is insanely fast

Thu Aug 20, 2009 4:35 pm

PerfectCr wrote:
He was great in the Disney movie.

Damn, you beat me to it. I was going to say he was probably racing to save Penny from a burning movie set. Ah well...

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