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wu :: forums    riddles    medium (Moderators: towr, Grimbal, Eigenray, ThudnBlunder, Icarus, william wu, SMQ)    The Led Ball « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: The Led Ball  (Read 2020 times) Moti Newbie     Gender: Posts: 17 The Led Ball   « on: Nov 6th, 2002, 1:46pm » Quote Modify a person is sitting inside a wooden boat in the center of a water pool.   that person holds a perfectly rounded ball of solid led (no air gaps) weighing 10 Kg. then he picks up the led ball and drops it into the water.   will the water level rise, drop or remain the same and why ? IP Logged S. Owen Full Member     Gender: Posts: 221 Re: The Led Ball   « Reply #1 on: Nov 6th, 2002, 1:57pm » Quote Modify This is like the "Anchor" puzzle under Easy - it's a good one. I can't find the discussion thread for that puzzle anymore though. It's a question of how much water the lead ball displaces while in the boat, and while in the water. IP Logged TimMann Senior Riddler     Gender: Posts: 330 Re: The Led Ball   « Reply #2 on: Nov 6th, 2002, 11:53pm » Quote Modify What I want to know is who led the ball, and where did they lead it to? Perhaps they led it astray!   IP Logged http://tim-mann.org/ towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: The Led Ball   « Reply #3 on: Nov 7th, 2002, 5:41am » Quote Modify While in the boat the lead ball displaces its weight in water, when in the water it displaces its volume in water. Since lead has a density greater than water the water level will drop..   (It displaces less water when in the water than when in the boat)   If you have an anchor the answer depends on wheter the anchor hits the bottom, or is still hanging from the boat.. « Last Edit: Nov 7th, 2002, 6:12am by towr » IP Logged Wikipedia, Google, Mathworld, Integer sequence DB william wu wu::riddles Administrator     Gender: Posts: 1291 Re: The Led Ball   « Reply #4 on: Nov 7th, 2002, 6:05am » Quote Modify [URL] http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_eas y;action=display;num=1027865690;start=8 [/URL]   (used search function to find it quickly) IP Logged [ wu ] : http://wuriddles.com / http://forums.wuriddles.com S. Owen Full Member     Gender: Posts: 221 Re: The Led Ball   « Reply #5 on: Nov 7th, 2002, 8:39am » Quote Modify Ah, I think I didn't set my search period back far enough. I didn't realize that thread was from over 3 months ago! Is there a way to change the default search period from the last 7 days to something like 365 days? IP Logged william wu wu::riddles Administrator     Gender: Posts: 1291 Re: The Led Ball   « Reply #6 on: Nov 7th, 2002, 10:13am » Quote Modify OK, I'll look into it. IP Logged [ wu ] : http://wuriddles.com / http://forums.wuriddles.com Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy => medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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