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past 88 Deville
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Discussion Starter #1
How many helium filled birthday balloons would it take to lift you off the ground?
where density of helium is 0.2 kg/m cubed
density of air is 1.3 kg/m cubed

this an extra credit problem that I wanna get full points. The last two I got full points but this one, I don't know how to start.
 

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04 Seville
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Wouldn't it depend on the max volume of the balloons to determine how many are needed?

My physics is a little rusty.
 

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The Northstar Tuner
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72°?
My birthday is in June so it is warm, but not August hot. If it was in January you would need triple the balloons.
 

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01 Eldo ETC, 02 Deville SOLD!
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They did this on a Mythbusters a few seasons back. It took about 2,000 balloons just to get a 3 year old rugrat off the ground, and they had a hell of a time just keeping the balloons all in one place...so the best answer is, as usual, Rolex's... :)
 

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2004 Escalade, 07 Road King, 08 Challenger SRT8
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712 Posts
JimHare is right....

The Mythbusters did this twice.

To raise a small child in a chair, it took several thousand "normal" sized balloons... took up a big warehouse, to get her up free floating...

They got Adam airborne in a lawnchair using weather-balloon style balloons... I wanna say it took 20 or 30 of the huge ballons to get him off the ground...

Very interesting, but dismaying to see how much it really takes.

A DVR is a dangerous thing... put Mythbusters in your series record list, and in time, you'll see them all in reruns, eventually...
 

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1970 Eldorado.
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This reminds me of an old grade school problem with the same ansewer.

"How many balls of kite string would it take to reach the moon?"


One if it's big enough.
So similar answer here: 1 baloon, if it is big enough to contain the volume of helium to lift the person.

The question is too vague. Lift where? On earth? In open air? From the bottom of the ocean?
Mass of the person? Size of the baloons? Density of the environment?

Thanks, this was a nice distraction...
 
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