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IWETHEY Home / IWETHEY Board / Open Forum / To the Moon! (Image enclosed)
Post #97,318
by Another Scott
4/18/03 3:57:33 PM
Reply
New To the Moon! (Image enclosed)
I think the rubber will eventually shatter if it hits something with high enough velocity, but I don't know if its terminal velocity in the atmosphere is high enough.

If you're tricky, you can send a Superball to the Moon (if reality follows the ideal physics)! [link|http://www.physics.gla.ac.uk/~kskeldon/PubSci/exhibits/D12/|Here]:

There are a number of physical concepts, such as transfer between kinetic and potential energy and momentum conservation, that can be demonstrated using bouncy rubber balls. One of the most popular is the superball bounce, where two or more superballs are dropped from a height one on top of the other. The result after the collision with the floor is quite surprising. If two balls are dropped simultaneously, one on top of the other, so that the top ball is much lighter that the bottom, then on collision with the floor the top ball will shoot up to a height much greater than the original dropping distance. This will work well when the ratio of the balls' masses is about five or more. Theoretically, if the ratio of the masses is infinite, then the lighter ball should reach exactly nine times the height of release.

[image|http://www.physics.gla.ac.uk/~kskeldon/PubSci/exhibits/D12/super.gif|0|Superball Bounce|383|685]

If seven balls are dropped from a height of 1km above the earth's surface, then the top ball attains a velocity greater than the escape velocity of the earth and will hit the moon!


Emphasis added.

Cheers,
Scott.
Post #97,319
by drewk
Picture of drewk
4/18/03 4:17:56 PM
Reply
New College trick
Take a large superball, one of the ones about three inches across. Get a new pencil, cut of the eraser just below the ferrule, and sharpen both ends. Insert one end into the superball just enough that when you hold the pencil the ball doesn't fall off. Drop this in a room with an acoustic-tile cieling.
===

Implicitly condoning stupidity since 2001.
     Money Question - (deSitter) - (19) - April 16, 2003, 01:52:24 PM EDT
         Dunno, but just in case - WTF were you thinking... - (CRConrad) - April 16, 2003, 02:00:35 PM EDT
         If they bounce - (jbrabeck) - (2) - April 16, 2003, 02:18:57 PM EDT
             Re: If they bounce - (deSitter) - (1) - April 16, 2003, 03:32:12 PM EDT
                 His bank bounces it back to your bank. - (jbrabeck) - April 16, 2003, 04:23:10 PM EDT
         you are entitled to deposit anything you wish - (boxley) - (1) - April 16, 2003, 02:20:55 PM EDT
             Box's advice seems to be the best by far -NT - (dmarker) - April 16, 2003, 05:26:35 PM EDT
         They WILL bounce - (broomberg) - April 16, 2003, 10:21:35 PM EDT
         Not sure about in the US. - (static) - (1) - April 17, 2003, 08:33:40 AM EDT
             Econ-LRPD: Jung would have wanted it this way. -NT - (Ashton) - April 17, 2003, 08:05:34 PM EDT
         Talk to your banker about it - (orion) - April 17, 2003, 08:57:18 PM EDT
         Physics Question - (deSitter) - (7) - April 17, 2003, 11:01:54 PM EDT
             superballs - (rcareaga) - (3) - April 18, 2003, 11:33:01 AM EDT
                 doing the math :-) - (boxley) - (2) - April 17, 2003, 11:46:01 PM EDT
                     Re: doing the math :-) - (rcareaga) - (1) - April 17, 2003, 11:57:59 PM EDT
                         Such wisdom in one so young :-) - (dmarker) - April 18, 2003, 05:57:24 PM EDT
             Heh. - (tseliot) - April 18, 2003, 03:34:31 PM EDT
             To the Moon! (Image enclosed) - (Another Scott) - (1) - April 18, 2003, 03:57:33 PM EDT
                 College trick - (drewk) - April 18, 2003, 04:17:56 PM EDT
         Current eBay fraud trick - (tuberculosis) - April 18, 2003, 12:59:15 PM EDT

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