Post by: Zer0 on 25/05/2021 22:33:32
What is the Fastest Accelerating Species on Planet Earth!
P.S. - Trick Question.
🐣
Post by: Halc on 25/05/2021 22:39:22
There's probably things that can beat that.
Post by: Eternal Student on 25/05/2021 22:59:40
Do we have to wait for the poll to close?
Post by: Petrochemicals on 26/05/2021 00:30:31
Post by: Eternal Student on 26/05/2021 11:25:42
Post by: Bored chemist on 26/05/2021 12:17:21
Something like 1000 to 10,000 g.
Post by: alancalverd on 26/05/2021 12:33:51
Just in case there are any young nerds reading this, a stapp is a unit of shock equal to one g-second, named after USAF Colonel John Stapp who investigated the effects of acceleration and particularly deceleration on the human body in the 1950s, mostly using himself as a crash dummy.
Post by: Bored chemist on 26/05/2021 12:43:13
... is the related term for rate of change of acceleration.
The first, second and third derivatives of jerk are snap, crackle and pop respectively.
Who says scientists have no sense of humour?
I think that's called deceleration.Not by physicists, who recognise that it's an acceleration in the opposite direction.
Post by: Bored chemist on 26/05/2021 13:16:20
So that opens the door to some odd bits of research.
https://www.liebertpub.com/doi/10.1089/ast.2020.2405
Annoyingly, it doesn't explicitly give the accelerations.
Post by: Zer0 on 27/05/2021 20:49:35
Hi Zero, I hope all is well.
Do we have to wait for the poll to close?
!!!Greetings!!! @Eternal Student
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Now coming onto your Query.
I had eventually chosen an Option to " Show Poll Current Results as soon as User Votes "... Hence, perhaps the Poll does in a way self reveal as time passes & more Users vote, then Percentages change.
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Post by: alancalverd on 28/05/2021 11:50:42
Quote from: alancalverd on 26/05/2021 12:33:51But pilots and drivers recognise the difference between blackout/wings bent upwards, straps loosening (acceleration) and redout/wings snap forwards/straps tightening/airbag deploying/engine coming at you from either direction (deceleration), which is why Col Stapp "flew" his rocket sled into a water trough to explore the more dangerous and less controlled problem.
I think that's called deceleration.
Not by physicists, who recognise that it's an acceleration in the opposite direction.
Post by: Bored chemist on 28/05/2021 18:12:30
Col StappOne of the important results of his work was rear facing seats on military aircraft.
In which case, when the plane slows down (in the conventional sense) the straps loosen etc.
No matter how hard you try to suggest otherwise, deceleration is just acceleration from a different PoV.
Post by: alancalverd on 28/05/2021 23:10:24
The reason for the rear-facing seats was largely driven by Stapp's early discovery of eye damage during what some politicians would call "acceleration from a different point of view", like an army "returning to previously established positions" is a "victory from a different pov".
A military wife of my acquaintance had the opportunity to spend a summer with her husband in the USA, with her children. They travelled in an RAF Hercules. The loadmaster offered to entertain the kids in the mostly-empty cargo bay. Back home, first day of school, traditional "what I did on holiday" essay, daughter wrote "We flew backwards to America and played football in the plane". Mother called to school and told daughter had disturbing fantasies.
Post by: Pseudoscience-is-malarkey on 31/05/2021 15:03:16
Post by: Bored chemist on 31/05/2021 15:41:30
"Use short words, so people understand you."Ok, that means
"acceleration"
and
"deceleration"
are both OK because they are the same length.
Or, should we use the "better known" word, since it is more likely to be understood?
Well, "acceleration" gets's a lot more hits on Google (300M ) than "deceleration" (15M).
So, it's probably more widely known.
What caused the eye damage was a force which could be calculated from the mass times the acceleration- as is standard practice in physics.
Essentially, it looks like you want to show off the (trivial) fact that you know a "fancy" word for slowing down.
like an army "returning to previously established positions" is a "victory from a different pov".If more armies recognised that battles are typically lost from both points of view, the world would be a calmer place.
Post by: alancalverd on 31/05/2021 17:18:30
The first, second and third derivatives of jerk are snap, crackle and pop respectively.
Derivatives, eh? Are we showing off, by any chance?
Post by: Bored chemist on 31/05/2021 17:47:00
I can't imagine who would have started such a thing; showing off a knowledge of obscure units....The first, second and third derivatives of jerk are snap, crackle and pop respectively.
Derivatives, eh? Are we showing off, by any chance?
Post by: alancalverd on 31/05/2021 23:56:07
Post by: Bored chemist on 01/06/2021 11:17:26
Shock has units of 9.8 metres per second- rebadged as the Stapp.
Obviously, that's a speed.
Call G 10 just to make the arithmetic easier.
If I slow my sledge down from , e.g. 100 m/s over the course of 10 seconds the acceleration is 10 m/s/s i.e. "1G" and the duration is 10 s
So the "shock" is 10*1=10. ( the same speed that I started with)
Now imagine that I let the sledge "coast" to a halt more gradually. It takes 100 seconds.
My acceleration is 1 m/s/s i.e. 0.1G and the "shock" is 0.1 * 100 = 10 m/s
Finally, imagine that I fire retro rockets and bring the sledge to a halt in 1 second.
The acceleration is 100 m/s/s or 10G
But, since the duration is only 1 second, the "Shock" is 10 * 1 i.e. 10m/s.
I think the physiological effects would be different; but the "shock" is the same.
What use is this measurement of initial speed in funny units?
Post by: alancalverd on 01/06/2021 14:10:46
It makes sense. A light tap with a hammer on your infantry helmet can produce an initial cranial acceleration/deceleration wave of 1000g but it won't last a millisecond (<1 stapp) or do any lasting damage, but 10 g for 1 second or any other 10 stapp combination takes a bit of getting used to, and 100 stapp of deceleration, however delivered, tends to separate the entrails though it is survivable if you are sitting backwards.
Winch launching a 2-seat glider is interesting. The student sits in front and is almost supine, and the instructor in the rear seat is upright. The initial acceleration is about 0.3g for about 2 seconds. I find it very disorienting to be subject to -0.3g in the front, but quite good fun to experience + 0.3g in the back. Your flying tortoise (et sim ninja turtle) has the advantage of near-symmetry, though I have spent some time with a vet designing a horizontal-beam x-ray facility for lateral views of a pregnant testudine because their insides distort under lateral g.
Post by: Bored chemist on 01/06/2021 14:15:39
Stapp discovered that the product pretty well determines the damage to a bag of giblets in jellyDid you read my post?
Do you really think that the effect on the rider's body of stopping a sledge from 100 m/s in 1 second is the same as doing it in 100 seconds?
Post by: Bored chemist on 01/06/2021 14:24:24
100 stapp of deceleration, however delivered, tends to separate the entrails though it is survivable if you are sitting backwards.OK We can arrange that by accelerating for 0.1g for 1000 seconds.
I think that's about what you would expect if you spent 15 to 20 minutes on a merry-go-round.
Would that do you any harm?
Post by: alancalverd on 02/06/2021 00:01:38
Do you really think that the effect on the rider's body of stopping a sledge from 100 m/s in 1 second is the same as doing it in 100 seconds?So here's the problem.
It is obvious that the body can sustain a lot of acceleration - say 100g - for a short time compared with the propagation time of an impulse across the body, but not for a long time as bits become detached or crushed depending on the sign of the acceleration. So the product of time x acceleration is an important parameter of harm. But as you say there is a threshold acceleration (probably around 2 - 3g) below which no harm seems evident however long it is sustained for.
So the graph of shock vs harm is actually a 3D surface rather than a simple curve. No problem.
Post by: Bored chemist on 02/06/2021 08:38:07
For things other than crashes, the frequency of vibration is also important.
But the tortoise still gets something like 1000 G.
Post by: alancalverd on 02/06/2021 12:18:19
But the tortoise still gets something like 1000 G.Really? What planet does he live on? What units of mass and length do they use? Terrestrial tortoises only get multiples of g.
Did you really calculate the terminal speed of a tortoise in air? What value did you get? (2 mph seems to be the horizontal limit, not determined entirely by air drag)
Post by: Bored chemist on 02/06/2021 14:05:58
(2 mph seems to be the horizontal limit, not determined entirely by air drag)Really, on what planet?
Here on Earth, the record seems to be
0.28 m/s
Equivalent to about 0.6 mph.
https://www.guinnessworldrecords.com/world-records/77951-fastest-tortoise
Did you really calculate the terminal speed of a tortoise in air? What value did you get?Of course I didn't.
I googled it.
https://casualcalculations.wordpress.com/2013/04/18/the-tortoise-and-the-hare/
... the terminal velocity of the tortoise is about 80 metres per second...
But all I did with that figure was to eyeball it and confirm "it's probably enough".
I calculated the acceleration the easy way.
Post by: Just thinking on 18/06/2021 22:51:08
Post by: syhprum on 21/06/2021 13:59:17
Post by: syhprum on 21/06/2021 14:13:59
Racing drivers occasionally suffer 50g acceleration if they run into Tyre barriers but live to tell the tale.
Post by: Bored chemist on 21/06/2021 17:19:32
I would not expect the tortoise to suffer more than 50 g it depends on the hardness of its shell and that of the rock.My calculation was based on about 10 metres (or more) and about 10 mm.
What figures did you use?
Post by: Just thinking on 21/06/2021 19:13:11
Post by: Zer0 on 25/06/2021 11:18:37
Correct Option - None of the Above.
👍
Are the following figures roughly approximately somewhat accurate?
(Incredible?)
" A tiny reptile called the rosette-nosed chameleon holds the current record among the amniotes: that is, animals that give birth on land, meaning reptiles, birds and mammals. It can flick out its tongue so rapidly that it briefly accelerates at 2,590m/s/s - about 170 times faster than the 15m/s/s maximum acceleration of the cheetah or the peregrine falcon. "
" Those first measurements, taken at 5,000 frames per second, showed that peacock mantis shrimps could accelerate their clubs at an eye-popping 104,000m/s/s; comfortably 20 times as fast as any amphibian or reptile. "
"However, it is not clear whether or not this "you have to be slow to be fast" idea plays out in all circumstance. Impressive though they are, the 1,000,000m/s/s accelerations achieved by trap-jaw ants are no longer world-beating.
Their record has been blown out of the water by the humble jellyfish. "
" When the cell is triggered and that elastic energy is released, a microscopic harpoon-like structure shoots out of the nematocyst. The harpoon can reach peak accelerations of about 50,000,000m/s/s: 50 times the peak trap-jaw ant acceleration. "
Source of Information -
http://www.bbc.com/earth/story/20160916-how-some-animals-accelerate-faster-than-all-others
Note - Link is Http!
P.S. - Thanks All for Participating.
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Post by: Just thinking on 05/07/2021 16:47:23