Topic: Puzzle 5

+ Puzzle 5
From	Message
Damo 02 Jan 03, 18:24	+ Puzzle 5 You are in a boat in the middle of a small lake. There is a very large stone in the boat with you. What happens to the level of water in the lake when you throw the stone out of the boat? (There is no water coming into or going out of the lake by any means)
Sweetmadness 02 Jan 03, 21:14	+ Puzzle 5 It stays the same??
Jon 06 Jan 03, 17:55	+ Puzzle 5 It's something to do with a 10th. Let's say a tenth of the mass of the boat is under water lets call the boat B. lets call the stone S 1/10 BandS is under the water. however once you put the stone underwater then you have 1/10 B + 1S is under water.... if you haven't noticed I don't have a clue so I'll shut up! Hi how is everyone then?
VALLEY 08 Jan 03, 13:58	+ Puzzle 5 woodnt the water stay da same cos da stone wood b throne in2 da water
Damo 09 Jan 03, 18:09	+ Puzzle 5 Jon is closer than he thinks (though I'm not sure where the 1/10 fits in!)
VALLEY 10 Jan 03, 08:52	+ Puzzle 5 i woz miles off cos i dont no anyfin
spookylukey 13 Jan 03, 10:32	+ Puzzle 5 OK,I'll have a go: Obviously, when you take the stone out of the boat, the boat rises in the water and the water level goes down. But when you put the stone in the water, the water level rises again - the question is "how much"? When you put the stone in the water, it displaces it's own volume and causes the water level to rise that much (divided by the area of the lake). But what happends when you put the stone in the boat? An object will stop sinking when the weight of water being displaced by it equals its own weight. So you can get a stone to float, even though it is heavier than water, by putting it in a cunning shape like a boat, so that as the boat sinks, it displaces much more water than the volume of the stone. So in a boat, the stone displaces more water than when you just put it in the lake. Conclusion: the water level sinks overall.
VALLEY 14 Jan 03, 08:39	+ Puzzle 5 yes!! thats just what i was thinking!!
Sweetmadness 14 Jan 03, 17:50	+ Puzzle 5 oooooooo i think i got it ! Obviously, when you take the stone out of the boat, the boat rises in the water and the water level goes down. But when you put the stone in the water, the water level rises again - the question is "how much"? When you put the stone in the water, it displaces it's own volume and causes the water level to rise that much (divided by the area of the lake). But what happends when you put the stone in the boat? An object will stop sinking when the weight of water being displaced by it equals its own weight. So you can get a stone to float, even though it is heavier than water, by putting it in a cunning shape like a boat, so that as the boat sinks, it displaces much more water than the volume of the stone. So in a boat, the stone displaces more water than when you just put it in the lake. Conclusion: the water level sinks overall.
Sweetmadness 14 Jan 03, 17:51	+ Puzzle 5 oh luke you soooo copied me i told you that! humph*
Jon 15 Jan 03, 20:25	+ Puzzle 5 Caz you make me LARF!
Jon 15 Jan 03, 20:27	+ Puzzle 5 Well if the weight ratio to displacement of water = 1/5th of the boats mass the stone has a displacement ratio of 1/1. therefore the water level rises
Damo 15 Jan 03, 22:32	+ Puzzle 5 Luke is of course absolutely right (based on the assumption that the density of the stone is greater than the density of water)
VALLEY 16 Jan 03, 18:12	+ Puzzle 5 i rekon it is.......... Obviously, when you take the stone out of the boat, the boat rises in the water and the water level goes down. But when you put the stone in the water, the water level rises again - the question is "how much"? When you put the stone in the water, it displaces it's own volume and causes the water level to rise that much (divided by the area of the lake). But what happends when you put the stone in the boat? An object will stop sinking when the weight of water being displaced by it equals its own weight. So you can get a stone to float, even though it is heavier than water, by putting it in a cunning shape like a boat, so that as the boat sinks, it displaces much more water than the volume of the stone. So in a boat, the stone displaces more water than when you just put it in the lake. Conclusion: the water level sinks overall.
Jon 17 Jan 03, 17:49	+ Puzzle 5 Or maybe it's because Obviously, when you take the stone out of the boat, the boat rises in the water and the water level goes down. But when you put the stone in the water, the water level rises again - the question is "how much"? When you put the stone in the water, it displaces it's own volume and causes the water level to rise that much (divided by the area of the lake). But what happends when you put the stone in the boat? An object will stop sinking when the weight of water being displaced by it equals its own weight. So you can get a stone to float, even though it is heavier than water, by putting it in a cunning shape like a boat, so that as the boat sinks, it displaces much more water than the volume of the stone. So in a boat, the stone displaces more water than when you just put it in the lake. Conclusion: the water level sinks overall.
Jon 17 Jan 03, 17:49	+ Puzzle 5 I think that jokes been made! Unlucky Luke... we genius must suffer
spookylukey 18 Jan 03, 16:04	+ Puzzle 5 thanks for helping me out there guys, that was really kind of you.
VALLEY 20 Jan 03, 08:46	+ Puzzle 5 anytime. damo! when you gona get some more for us Brainboxes!
Most_Magical 10 Feb 03, 15:18	+ Puzzle 5 Confusion, confusion, confusion...
VALLEY 17 Feb 03, 16:26	+ Puzzle 5 maybe you shud get a brain