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Title: The Led Ball Post by Moti on Nov 6th, 2002, 1:46pm 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 ? |
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Title: Re: The Led Ball Post by S. Owen on Nov 6th, 2002, 1:57pm 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. |
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Title: Re: The Led Ball Post by TimMann on Nov 6th, 2002, 11:53pm What I want to know is who led the ball, and where did they lead it to? Perhaps they led it astray! :P |
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Title: Re: The Led Ball Post by towr on Nov 7th, 2002, 5:41am 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.. |
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Title: Re: The Led Ball Post by william wu on Nov 7th, 2002, 6:05am http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_easy;action=display;num=1027865690;start=8 (used search function to find it quickly) |
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Title: Re: The Led Ball Post by S. Owen on Nov 7th, 2002, 8:39am 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? |
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Title: Re: The Led Ball Post by william wu on Nov 7th, 2002, 10:13am OK, I'll look into it. |
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