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Ball in a Hole


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530 replies to this topic

#11 Veracity

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Posted 18 May 2007 - 05:31 PM

lol, Yeah, O.k, and while we are at it, Why not just seek a magical lamp, rub a genie out, and WISH the ball to the top of the pipe. Can't everyone just Take the question at face value and not rip apart every potential flaw. Come on people...lol
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#12 W_Stilwell

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Posted 08 June 2007 - 12:26 PM

Velcro sticks to tennis balls.
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#13 larryhl

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Posted 08 June 2007 - 02:34 PM

Velcro sticks to tennis balls.



It's a table tennis ball, otherwise known as a ping-pong ball. I have yet to see Velcro stick to an unaltered table tennis ball.
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#14 schmiggen

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Posted 08 June 2007 - 05:54 PM

Although it was never specified, I believe it to be implied in the original challenge for the pipe to have a sealed bottom and was unable to turned upside down.



I think benjr's right. This would mean that any sucking/vacuum solutions wouldn't work. Creating a vacuum in the pipe (or area of lower pressure approaching a vacuum) would do no good, because you'd just have a closed system in the vacuum+pipe of essentially uniform pressure, which would not move the ball (which I think is supposed to be a ping-pong ball -- table tennis, right?). Even though you're sucking out of one side of the pipe, the air you remove from the pipe is mostly on the wrong side of the ball, so it probably wouldn't move the ball very much, and if it did move the ball at all, gravity never stopped pulling down on the ball, so it would inevitably undo any motion caused by the flow of a little air in the opposite direction.

Also, trying to use a vacuum is different from filling the pipe with water, because buoyancy is a different thing entirely. You could even fill the pipe with a decently heavy gas and the ball should eventually rise to the top, because the solid part of a ping pong ball isn't very dense and on top of that doesn't take up much of its volume.
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#15 sk8erfou

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Posted 11 June 2007 - 09:38 AM

of course that doesnt rule out the double sided tape... also if you were to have a suspended pipe which isnt against the rules =) take a shovel or something and hit the top right where the hole is on the flat side... and the bottom will shoot out
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#16 KCshushu

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Posted 20 June 2007 - 02:19 PM

And at the end of the day, make sure you fill that damned pipe up...which really only seems to by a cylindrical hole in the ground.
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#17 MasterHandyman

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Posted 21 June 2007 - 06:26 PM

By using suction or forced air into the hole
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#18 swinguru

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Posted 21 June 2007 - 07:51 PM

Fill the pipe with water. The tennis ball will float to the top.
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#19 MasterCoder

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Posted 22 June 2007 - 02:01 AM

I agree with swinguru, filling the pipe with water is the best choice if the pipe does not go all the way through. If it does then a vacuum is the best bet.
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#20 miked32

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Posted 22 June 2007 - 03:25 AM

Good Lord, are you people serious? Vacuum cleaner? Velcro? Magic lamp??? Have you ever heard the phrase "floats like a cork?" Well, table tennis balls float even better than corks!!
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