Profound Query of the Day

trojan698 said:
What about say 3m of bubble wrap? Assuming you didn't just make that up of course.
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I think bubblewrap would be too dense.
E.g. think of diving into water.. really soft when you jump in froma low height, form 50ft it is like hitting concrete.

You would need a gradual accelerating reverse force to prevent injury.
 
Visage said:
In a sense, you're right, but if the wrap takes too long to compress you hit the ground ;)

The wrap has to stop you before it compresses to the point at which you hit the ground.....
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You still need to take into account the compressability of the bubblewrap, the uvats formula you (and I) used is only for a single point in time and so not actually comparable, it will only show the Maximum G-force on the body.

Im seriously considering emailing a bubblewrap company to see what its compressability is so we can finish the question properly. :p

I think though that Daz's idea of 0.1 second could be about right, the problem is there are so many variables at the point of impact, could the bubblewrap not actually take the pressure and so slow the person down a bit then just hit the floor.

Using 0.1 seconds to stop and my terminal velocity (as yours is too high) I make a G-force of 40G, even more survivable than my previous estimate. ;)
 
Amp34 said:
You still need to take into account the compressability of the bubblewrap, the uvats formula you (and I) used is only for a single point in time and so not actually comparable, it will only show the Maximum G-force on the body.

Im seriously considering emailing a bubblewrap company to see what its compressability is so we can finish the question properly. :p

I think though that Daz's idea of 0.1 second could be about right, the problem is there are so many variables at the point of impact, could the bubblewrap not actually take the pressure and so slow the person down a bit then just hit the floor.

Using 0.1 seconds to stop and my terminal velocity (as yours is too high) I make a G-force of 40G, even more survivable than my previous estimate. ;)
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I think we're going about it the wrong way. We need to start by saying what is the maxiumum G we could tolerate, and then work out the qualities of the material that we need.....

In order to be practical, you wouldnt want to use more than, say 10m of material, but you'd need a material that is compressable right up to this limit, to allow the force to be applied over as long a period as possible.
 
MasterMike said:
The key word there being "mahoosive", which I'm assuming is derived from "massive". 1 metre of bubble wrap is nothing to the size of the giant inflatables stuntmen use.
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Which is why I said you'd need more than a meter or so of bubble wrap :rolleyes:. With enough wrap, it's definitely possible.
 
What if there was a bit of forward momentum and spin so the bubbblewrap ball would roll as it hit the ground?

And how do we breathe in this bubblewrap tomb anyway?
 
A.N.Other said:
Which is why I said you'd need more than a meter or so of bubble wrap :rolleyes:. With enough wrap, it's definitely possible.
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Thats impossible to say without knowing more about the macroscopic properties of the bubble wrap - if the wrap is too stiff, for example, it wont deform fast enough to stop the body before it hits the ground.

If, on the other hand, its too elastic, the body will not lose any energy at all upon impact, with equally bad results.....
 
A.N.Other said:
Which is why I said you'd need more than a meter or so of bubble wrap :rolleyes:. With enough wrap, it's definitely possible.
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I certainly wouldn't want to try it with less than 5 metres of bubble wrap.

Have your rolleyes back. :rolleyes:, it was a bit uncalled for.
 
malc30 said:
No because on impact your organs would smash againt your ribs etc and kill you Dead.
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What if you wrap your organs in a metre of bubble wrap and throw them seperately?
 
Is this right? (assuming constant acceleration)

a=(v^2-u^2)/2s
a=(-2916)/2 (assuming that the 1m of bubble wrap fully compresses and 54m/s terminal velocity)

a=-1458ms^-2

F=ma
F=100*1458 (assuming person+bubbles=100kg)
F=291600N

This assumes the bubble wrap has the correct properties with which to stop the fall in exactly 1m.
 
p4radox said:
Is this right? (assuming constant acceleration)

a=(v^2-u^2)/2s
a=(-54)/2 (assuming that the 1m of bubble wrap fully compresses and 54m/s terminal velocity)

a=-27ms^-2

F=ma
F=100*27 (assuming person+bubbles=100kg)
F=2700N

This assumes the bubble wrap has the correct properties with which to stop the fall in exactly 1m.
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You didnt square the velocity when calculating a....

EDIT: Damn your ninja edit....
 
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