View Question
 Question
 Subject: Answer this riddle for two dollars Category: Miscellaneous Asked by: sevennus-ga List Price: \$2.00 Posted: 09 May 2004 01:22 PDT Expires: 08 Jun 2004 01:22 PDT Question ID: 343446
 ```You are in a conrete room. There is a steel pipe 25 centimeters in length cemented into the center of the concrete floor. The pipe portrudes about 15 centimeters out of the ground. A ping pong ball is dropped down the pipe. There is about a quarter of a centimeter clearance around the ping-pong ball and the pipe. Your task is to get the ping pong ball out of the steel pipe undamaged. The only items that are available are a wooden ruler, a ball of string, a pocket mirror, a paper clip, and a small magnet. Since nothing else is allowed into the room, how could you get the plastic ping-pong ball out of the pipe?```
 Subject: Re: Answer this riddle for two dollars Answered By: till-ga on 09 May 2004 02:08 PDT Rated:
 ```The answer is: "Pee in the hole." "Ping Pong in a Tube Teaser ID #2158 Fun (2.97) Difficulty (2.17) Category Science Submitted By RayneeDay You are in a room that is an 8x8x8 perfect cube. There are no windows, or doors (don't ask me how you got in there!) In the center of the floor there is a 12 inch pipe that is sticking 6 inches out of the floor. In the bottom of the pipe is a ping pong ball with a diameter that is one millimeter smaller than the inner diameter of the pipe. You have a 12 inch piece of string, a match, a magnifying glass, a 6" ruler and a paper clip. How do you get the ping pong ball out of the hole? from: ( http://www.braingle.com/brainteasers/teaser.php?op=2&id=2158&comm= ) till-ga Search strategy: ( ://www.google.de/search?sourceid=navclient&hl=de&ie=UTF-8&oe=UTF-8&q=ping+pong+ball+pipe )```
 sevennus-ga rated this answer: `you got it!`

 ```I don't believe that. 25 cm x ping pong ball size = a lot of pee. Good luck doing that. I would bend the paper clip into a semi-circle and tie the string on both sides. Lower it into the hole and when it hits the top of the ping-pong ball it will fall to a side. Regardless of which side it falls to it will be "parallel" with the pipe wall and fall down the edge to the bottom. Pull gently, at an angle away from the side the clip fell on (if you can't see down there, shine light down with the mirror) ... it should lift the ball slightly as well as move the clip slightly under. Do a few short snaps until the ball bounces/rolls on top of the semi-circle paper clip (it should rest between the groves of the wires). Gently pull ball to safety. Sure it takes patience. But it's better than waiting a few days hoping you'll piss fast enough to fill the pipe since you need so much volume and you're racing against evaporation.```
 ```Dear Sevennus, Would you have enough urine available? An interesting question! According to http://tabletennis.about.com/library/glossary/bl-B.htm the regulation table-tennis ball is 38 or 40 mm in diameter. With a quarter-centimetre clearance all around, that makes a pipe of around 45 mm diameter. The volume of 25 cm of this pipe (pi-r-squared-h) is almost 400 ml. From http://hypertextbook.com/facts/2001/DanielShaw.shtml we see that the typical adult human bladder can contain 600 to 800 ml, but that the "micturition point" (at which there is an urge to evacuate the bladder) is between 150 and 300 ml. So you would probably have empty a full-feeling bladder twice to achieve the object. I trust this helps. Carnegie Search terms: table-tennis ball size mm; human bladder capacity```