How absurd are these numbers really?

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Discussion Overview

The discussion revolves around hypothetical scenarios involving extreme acceleration and its effects on a human body, framed within a context of absurd numbers derived from a test. Participants explore the implications of such high accelerations and the potential consequences for both the individual and the surrounding environment.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant presents a scenario involving a 20 kg "person" accelerating at 1.8 x 10^5 m/s² for a brief duration, questioning the real-world implications of such an event.
  • Another participant expresses confusion over the meaning of the scenario and suggests that the described acceleration resembles a cannon rather than a human experience.
  • There is a suggestion to convert the acceleration into "g" to contextualize survivability, with references to records held by motor racing drivers.
  • One participant argues that unrealistic numbers can be beneficial for educational purposes, as they help students understand the importance of units and result evaluation.
  • A later reply discusses the fatal consequences of such acceleration, emphasizing that any method of acceleration other than gravity would likely be lethal.
  • Another participant provides a comparison of deceleration experienced by a bug hitting a windshield, illustrating the extreme forces involved in high-speed impacts.
  • There is a mention of historical experiments related to g-force survivability, noting that a racing driver survived a crash at 150g, while rocket sled experiments reached about 60g.
  • One participant questions whether the discussion is related to a book plot.

Areas of Agreement / Disagreement

Participants express a range of views, with some agreeing on the extreme nature of the acceleration and its likely fatal consequences, while others debate the educational value of using absurd numbers in problem-solving. Overall, the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants highlight the need for clarity regarding the conditions under which acceleration is applied and the potential for misunderstanding due to the absurdity of the numbers involved. There are also references to missing decimal points and the need for accurate representation of physical scenarios.

Gabriel Ulisses
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I stumbled upon these numbers on my test recently.
It is raelly basic stuff, but i want to know, what would actually happen if such thing happened in the real world.
We basically have a ball made of 20Kg of "person".
And it it accelerates at 1.8*10^5 m/s² for 1/30 of a second reaching 6000 m/s in such a short time.
This is essentialyl an explosion right?
Such high numbers, what would happen to the person herself and the environment around him?
 
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Gabriel Ulisses said:
We basically have a ball made of 20Kg of "person".
I have no idea what that means.
And it it accelerates at 18*10^5 m/s² for 1/30 of a second reaching 6000 m/s in such a short time.
This is essentialyl an explosion right?
It sounds more like a cannon.
[Note: I think there is a missing decimal point in the acceleration]
Such high numbers, what would happen to the person herself and the environment around him?
What person? What environment?
 
Divide the acceleration by 9.81 to convert it to "g". Then Google the maximum g ever survived. As I recall a motor racing driver holds the record.
 
russ_watters said:
I have no idea what that means.

It sounds more like a cannon.
[Note: I think there is a missing decimal point in the acceleration]

What person? What environment?
It was just to state that it would someone, and not something, the effects such conditions would have on the human body.
Basically i asked: "What would happen to someone if he were to accelerate like this in the most mundane of situations? Would his skin melt due to friction and air resistance? His limbs detache from his body due to inertia? or would there be no person left after all?
And i did miss the decimal at 18, fixed it now, thanks :)
 
I don't think that realistic numbers are necessary to do an exercise. It might even be helpful to calculate something absurd to get students used to think about results. When tutoring schoolkids, they often either forgot units or added two different ones. In these cases I often used "trees" as a unit, to illustrate that 5 trees can be doubled or added to other trees, but one cannot add trees and bushes. So being absurd doesn't automatically disqualify a problem.
 
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Gabriel Ulisses said:
It was just to state that it would someone, and not something, the effects such conditions would have on the human body.
Basically i asked: "What would happen to someone if he were to accelerate like this in the most mundane of situations?
It would depend on how the acceleration is applied. Any method I can think of except gravity would be fatal.
 
CWatters said:
Divide the acceleration by 9.81 to convert it to "g". Then Google the maximum g ever survived. As I recall a motor racing driver holds the record.
So the op asks if 1,800,000m/s/s is survivable... That's about 180,000g. A racing driver called David Purley just about survived a150g crash and that's thought to be the word record. Rocket sled experiments in the 1960s stopped at about 60g.
 
Is this all to do with the plot of a book?
 

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