B How absurd are these numbers really?

[Gabriel Ulisses]

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?

 

[russ_watters]

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?

 

[CWatters]

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.

 

[Gabriel Ulisses]

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 :)

 

[fresh_42]

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.

 

[russ_watters]

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.

 

[jrmichler]

If we assume that the person is accelerated by a flat plate, then SPLAT. Some quick numbers to show why:

A 1/8" bug hitting a windshield at 60 MPH will decelerate at 11,600 G if we assume constant deceleration over 1/8".
1.8E5 m/sec^2 / 9.8 = 18,400 G.

Somewhat related: A study of the force of raindrops on mosquitos: https://www.popsci.com/science/article/2013-06/fyi-how-do-mosquitoes-survive-rainstorm

 

[CWatters]

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.

 

[sophiecentaur]

Is this all to do with the plot of a book?