[Lab] what's an ipod touch weigh?

jeanmarc.leblanc at gmail.com jeanmarc.leblanc at gmail.com
Tue Sep 20 16:21:26 EDT 2011

you chould try a chemical reation to inflate a baloon like air bags.

if you mix sodium and wanter you might get what you want (not sure just a  

On , bentfork at gmail.com wrote:
> Hmm...

> Using t = sqrt ( 2d/g )

> and a distance of 42 metres I get a total drop time of about 2.9 seconds  
> with out a parachute...

> I also want to say, I love this Wikipedia page:

> http://en.wikipedia.org/wiki/Equations_for_a_falling_body

> On 20 September 2011 16:06, bentfork at gmail.com> wrote:

> I'm tempted to see if I can inflate a balloon fast enough to make it  
> never reach the ground ;) According to wikipedia  
> (http://en.wikipedia.org/wiki/Lifting_gas#Hydrogen_versus_helium) ...

> the buoyant mass for one m3 of hydrogen in air is:

> 0.090 kg * (1 - (1.292 / 0.090) ) = -1.202 kg

> A standard touch seems to weigh about 100g

> www.apple.com/ipodtouch/specs.html

> Quote of the 'rules'


> The sky is the limit with your designs but you have to keep the following  
> constraints in mind:

> Freefall means free fall so it's gotta be graceful. There can be no  
> external

> forces affecting the device or the drop

> won't qualify. This means no spinning, launching, or aggressively

> tethering the device. No parachutes.

> Fall height. We'll be dropping these preservers from

> way way up, so be prepared for fall heights upwards of 140 feet.

> This may be a lot of fun

> On 20 September 2011 10:27, Darcy Whyte darcy at siteware.com> wrote:

> http://contest.freefallhighscore.com/contest.html

> I got some ideas for this egg-drop challenge. Anybody want to try?

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