That Interview Question
When I went for my interview with Geoservices last year the nice french man asked me to explain Boyle's Law. The only Boyle I could think of was Danny Boyle.
Anyway, Karen has another interview question - though, I thought this one was pretty easy until MWK made it more complicated.
(My answer is backward, by the way - the balloon will go backward in reference to the passenger compartment.)
(I wished I'd googled before I spoke. I believe though if you accelerate hard enough it will go backwards, overcoming Archimedes.)
«4 CommentsJanuary 29, MMIV»
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You got the right answer, I still don’t know how because Bernoulli’s principle would make the ballon sink - as the air rushes past the balloon from front to back it travels faster over the shallow top part of the balloon than the steep bottom side, thus creating a low pressure zone beneath it. You and you’re bernoulli made me get the wrong answer!
Hmm, I thought that the air rushing over would create the low pressure in front of it, hence why it moves forward. Of course, I am assuming that the air flows down the length of the balloon.
I almost put this in ASCII art in this post to demonstrate it. But I won’t. For I am not a geek.
But in that direction the balloon front is the same surfacr area as the back, therefore the air moves at equal speed past both side and no pressure change.
The balloon moves because the air is less dense at the front of the car (having all been dumped to the back by the force of acceleration) and the helium ‘rises’ until it’s density matches that of the surrounding air. Or something Archimedian like that.