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Riddle (OQ) - IPY

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Philip1
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Re: riddle(OQ)

Unread post by Philip1 » Wed Jan 02, 2013 4:54 pm

:hmz: Forward it is :?
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Re: riddle(OQ)

Unread post by onewithnature » Wed Jan 02, 2013 5:08 pm

Thanks for the explanation, Rooies. :thumbs_up: I'm interested to hear why you say the balloon will go forward, Philip; or is that just a guess?
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Re: riddle(OQ)

Unread post by Rooies » Wed Jan 02, 2013 5:18 pm

@ RosemaryH You can call me anything, even Rooi Krokodil. 8) Just don't accuse me of not trying to figure out the riddles. :D

To be more exact. In relation to the vehicle, the balloon stays in place. Viewed from the outside, the balloon moves forward.
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Re: riddle(OQ)

Unread post by onewithnature » Wed Jan 02, 2013 6:13 pm

Clever answer, Rooies. I can see you're a thinker. :wink: Waiting for Philip's explanation too.
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Re: riddle(OQ)

Unread post by Philip1 » Wed Jan 02, 2013 6:19 pm

A helium filled balloon is much lighter then our bodies. So when a car accelerates, our body tends to move backwards and the much lighter balloon will move forward the same as the car :hmz:
:) Would you like more :)
"Lose yourself in Nature and find Peace!" (Ralph Waldo Emerson)
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Re: riddle(OQ)

Unread post by onewithnature » Thu Jan 03, 2013 6:20 am

Please clarify a little more for me, Philip, if you will: do you mean that the balloon will move backwards, forwards, or stand still, within the car, but relative to it, as it accelerates?
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Re: riddle(OQ)

Unread post by Philip1 » Thu Jan 03, 2013 6:34 am

The same direction as the car = forward, moving away from the centre, towards the windscreen. (Gravity and air pressure)
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Re: riddle(OQ)

Unread post by onewithnature » Thu Jan 03, 2013 8:09 am

Rooies, nice try; however, because the surrounding air is heavier than the helium balloon, as the car accelerates, the air will move towards the back, pushing the balloon forwards towards the windscreen! Strange, but true. :thumbs_up: Well done, Philip. :clap: :clap:
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Re: riddle(OQ)

Unread post by Rooies » Thu Jan 03, 2013 9:02 am

Like the Kudu horn system, I guess I have now earned my fifth Krokodil and thereby became a legendary Krokodil. I think I should stay with Good Morning, Good Afternoon.... That one I can't get wrong. :doh: :D Or better still, join the :thumbs_up: :D brigade
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Re: riddle(OQ)

Unread post by onewithnature » Thu Jan 03, 2013 9:22 am

Rooies, how can you win the Lotto if you never try! :twisted: Always love your participation on the quizzes, and elsewhere on the forum; so don't you dare disappear! :wink:
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Re: riddle(OQ)

Unread post by Rooies » Thu Jan 03, 2013 11:21 am

OWN, I have trust in your superior knowledge but something is worrying me. You say that the air in the vehicle will move backwards because it is heavier than helium. Now if your theory is correct than the lighter helium will push the heavier air in front of the balloon out of its way to move to the front of the vehicle. The balloon will have to overcome the resistance of the heavier air. This doesn't seem correct. If you put a light ball in the center of a bucket of water inside the car, should the ball then move towards the side of the bucket, if the vehicle moves? If you throw a light stick in a stream of water, it will go with the flow but a heavy stone will sink.
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Re: riddle(OQ)

Unread post by onewithnature » Sat Jan 05, 2013 2:26 am

Rooies, the way I understand it is that, as the vehicle moves sharply forward, the air in the car will flow backwards, creating a relative and partial vacuum towards the front of the vehicle, and hence in front of the balloon. Less impeded by the denser air that was in front before the car moved, the balloon will now slide forward into the vacuum.

As to your analogy with a ball in a bucket of water, I think that, as the car moves forward, the water and ball will (hopefully) remain in the bucket and so gain momentum. When the car slows down, the water and ball will continue to move forwards; the water will be stopped by the bucket surface, allowing the ball - which has less resistance being on the surface of the water - to move forward against the front of the bucket.
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TR: PRIMEVAL PLEASURE

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Re: riddle(OQ)

Unread post by Rooies » Sat Jan 05, 2013 8:31 am

@ OWN. The way I see it is that the air in front of the balloon will follow the path of least resistance when moving backwards, and therefor directly to the back. In the process of moving backwards, it surely will take a lighter object with it. IMHO, when the heavier air is pressed against the back, the balloon will 'pop' out and then move forward, when the 'compressed' air starts to even out after acceleration.

Very good question :clap: :clap: More please
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Re: riddle(OQ)

Unread post by onewithnature » Sat Jan 05, 2013 8:37 am

Rooies, now that I think about it, it is a possibility that the initial backwards movement of air may indeed dislodge the balloon for a moment, but then the partial vacuum will be rapidly created and the light balloon should move promptly into the low pressure area. Also, I wonder if the upward push of the helium on the balloon wouldn't rather keep the balloon against the car's ceiling? Two things are required to happen here to resolve this for good: (i) we must invite a physicist to come on here and clarify (do you know any good ones?); and (ii) we need to actually try it out with a real helium balloon and a real car - anyone volunteering? :hmz:
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Re: riddle(OQ)

Unread post by Rooies » Sat Jan 05, 2013 8:51 am

Good suggestion OWN. We can have our own 'mythbuster' team. :thumbs_up:
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