Re: [Phys-l] loud bag...physics?

[Bernard Cleyet <bernardcleyet@redshift.com>]

Again I "point out"  It's not blowing up the bag or stretching, but flexing it.  Here's a clip showing flexing and the resulting "speaking".

http://www.youtube.com/watch?v=sDRHWwiEg3E

And here's a clue to it's construction:

http://www.youtube.com/watch?v=czX8Ea6MvZE&NR=1


At first I though it was Al backed, but then is it biodegradable because the Al film will oxidize readily?  One paper describes using C to make PLA conductive and this one found a high bulk resistivity.

http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=TRD&recid=20070650191856MT&q=&uid=789508895&setcookie=yes

bc doesn't eat white potatoes


the comments following the Sun Chips one belong in the efficiency thread:

http://www.redditgadgetguide.com/r/AskReddit/comments/bkc4i/anyone_get_that_super_loud_sun_chips_bag_100/



On 2010, May 29, , at 19:25, Brian Whatcott wrote:

> It is a sadness of composite materials, that when they reach their limit,
> they fly apart - sometimes in an explosive hail of dust.
> When structural steels and aluminum alloys reach their limit, they
> yield, and if the excess load is  not too high,  return from the
> exceedance with a permanent bend or stretch.