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Topic: Three Eggs. (Read 2176 times) |
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rloginunix
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Three Eggs.
Each one of the three identical clear see-through glass jars contains the identical amount of clear see-through water and one egg. All three eggs are real and identical also.
However, we see that in the first jar the egg is at the bottom, in the second jar the egg is in the middle, and in the third jar the egg is at the top of the water level:
What would be the simplest explanation of this?
Clarification: it has nothing to do with optics - there are no mirrors, screens, nylon strings, etc.
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towr
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Re: Three Eggs.
« Reply #1 on: Jul 6th, 2014, 12:56am » |
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Different salt-content (and thus density) of the water.
From the description everything is identical but the water.
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EdwardSmith
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Re: Three Eggs.
« Reply #2 on: Jul 6th, 2014, 2:17am » |
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I think that bad eggs float.
So maybe theres one ok egg, one not too bad and a bad egg.
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alien2
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Re: Three Eggs.
« Reply #3 on: Jul 6th, 2014, 4:26am » |
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Eggs in the 2nd and the 3rd jar are descending.
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towr
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Re: Three Eggs.
« Reply #4 on: Jul 6th, 2014, 7:01am » |
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on Jul 6th, 2014, 2:17am, EdwardSmith wrote:I think that bad eggs float.
So maybe theres one ok egg, one not too bad and a bad egg. |
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Yeah, but they're identical eggs. So that wouldn't work.
(Must have been a difficult birth for the chicken, identical tripleggs  )
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rloginunix
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Re: Three Eggs.
« Reply #5 on: Jul 6th, 2014, 9:38am » |
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Yes, but this Mother Hen practiced before - earlier she delivered two identical eggs when these were needed to be thrown off of a 100-story building. She must be a scientifically inclined chicken (of uniform density) who listens to audio tapes of lectures on math and physics ...
towr gave the intended answer - no salt in the first jar and the appropriate amounts of it in the remaining two jars.
Credit also must go to Alien2 - that's a very good idea. I didn't think of it myself. Basically, it could be a snapshot or a photo picture of a carefully orchestrated event. Well done!
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rloginunix
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Re: Three Eggs.
« Reply #6 on: Jul 6th, 2014, 2:32pm » |
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While we are still on the subject. Two identical eggs this time.
You are told that one egg is raw (not cooked) and the other one is hard boiled.
How do you distinguish one from the other?
Both eggs are in their original form and visually indistinguishable.
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dudiobugtron
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Re: Three Eggs.
« Reply #7 on: Jul 6th, 2014, 2:46pm » |
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Crack them open. 
Or, slightly less destructively, Hold them up to your ear and shake them. The yolk won't swish around in the albumen if it's hard boiled.
My attempts at original puzzle:
a) The jars are on their sides, filled with water. Each is on a slightly differently inclined plane. The egg in each acts like a spirit level. (It would have to be rotten for the behaviour to mimic a spirit level's, of course, otherwise it would be the reverse.) Therefore we know that the plane that the middle jar rests on is the most level.
b) The water is in identical amounts, but is it identical? If not, then the water in the different jars has could have different densities (eg: due to temperature).
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Lupin
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Re: Three Eggs.
« Reply #8 on: Jul 6th, 2014, 6:16pm » |
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Quote:Posted by: rloginunix
Posted on: Today at 2:32pm
While we are still on the subject. Two identical eggs this time.
You are told that one egg is raw (not cooked) and the other one is hard boiled.
How do you distinguish one from the other?
Both eggs are in their original form and visually indistinguishable. |
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spin them
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rloginunix
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Re: Three Eggs.
« Reply #9 on: Jul 7th, 2014, 7:19am » |
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dudiobugtron, original puzzle: a) can't work because all the jars are at one level and all the eggs are identical. b) is correct but looks like for a wrong reason - density is changed with salt, which dissolves and remains invisible.
Raw/cooked puzzle: both eggs must remain intact. Try again. The answer is more scientific. It has to do with physics.
Lupin gave the correct intended answer: you put them on a smooth horizontal surface and spin them applying the same amount of effort (torque). The cooked egg will actually spin while the raw egg will wobble a bit and stop almost right away.
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rmsgrey
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Re: Three Eggs.
« Reply #10 on: Jul 8th, 2014, 6:35am » |
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Even cooler way of distinguishing the two eggs: Get them both spinning at the same rate, and abruptly stop each of them. The cooked egg will stay stopped; the raw one will start spinning again
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rloginunix
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Re: Three Eggs.
« Reply #11 on: Jul 8th, 2014, 7:04am » |
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Good catch. From my personal experience (yeah, I know, its scary) - friction is the key. rmsgrey's method will only work on very smooth surfaces - linoleum, hardwood floor, glass. For a pronounced effect give it some time to spin, don't stop it right away.
The third method quickly outranks "easy" - be patient as you'll have to try it several times on the surfaces of varying gripping power. The effect you are looking for is only the cooked egg will stand on its end for a brief moment if spun correctly.
It feels quite unnatural as the center of mass rises doing work against gravity. I think it relates to a youtube video of a wooden discus with an off center circular hole doing the same thing where friction is also a key - it wont' work on ice, for example.
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dudiobugtron
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Re: Three Eggs.
« Reply #12 on: Jul 8th, 2014, 12:39pm » |
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on Jul 7th, 2014, 7:19am, rloginunix wrote:| Raw/cooked puzzle: both eggs must remain intact. |
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I'm not sure what counts as 'intact', but depending on where you sourced your eggs from, you could tell them apart by incubating them for long enough.
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Edit: fixed my misspelling of 'inctact'...
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| « Last Edit: Jul 8th, 2014, 12:40pm by dudiobugtron » |
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rloginunix
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Re: Three Eggs.
« Reply #13 on: Jul 9th, 2014, 11:52am » |
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The idea is original - your are thinking outside the box - but it won't work. Intact here means that the structural integrity of both eggs' shells can't be violated. Both eggs must remain wholesome or "in one piece" before, during and after the test.
Suggestion: do to eggs what the third planet does to you (even though you don't really feel it).
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JaneBD
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Re: Three Eggs.
« Reply #14 on: Aug 4th, 2014, 6:24pm » |
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Different water ...
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lillianj
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Re: Three Eggs.
« Reply #15 on: Aug 19th, 2014, 11:57am » |
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I done this bad eggs float for sure 
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gregpap
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Re: Three Eggs.
« Reply #16 on: Aug 19th, 2014, 2:40pm » |
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The egg either floats or sinks to the bottom, according to Archimedes theory, the weight of the object is equal to the weigh of the water it expels...
So if the three eggs are whole in the water that means they weigh the same so it's impossible to be in different positions and float there...
So the answer might be that we are looking just at a snap shot and eventually the eggs will go to the bottom...
What is the solution...
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| « Last Edit: Aug 19th, 2014, 2:42pm by gregpap » |
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gregpap
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Re: Three Eggs.
« Reply #17 on: Aug 19th, 2014, 2:43pm » |
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The solution to the second question would be just to place them near a lamp
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movie4fun
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Re: Three Eggs.
« Reply #18 on: Aug 20th, 2014, 12:45am » |
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on Aug 19th, 2014, 2:40pm, gregpap wrote:
So the answer might be that we are looking just at a snap shot and eventually the eggs will go to the bottom...
What is the solution... |
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I think that is probably the correct answer. The pics were taken of the same egg in three different time phase.
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gregpap
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Re: Three Eggs.
« Reply #19 on: Aug 20th, 2014, 2:04am » |
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Sorry, I am from my iPad, could not see the hidden answers...tnx
P.s. Is there any solution to the safari users....
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Grimbal
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Re: Three Eggs.
« Reply #20 on: Aug 20th, 2014, 6:35am » |
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You can press "quote" on the post and see the source. Then navigate back or cancel.
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unkwoop
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Re: Three Eggs.
« Reply #21 on: Aug 27th, 2014, 6:19am » |
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How about the eggs have the same density as the water and are buoyant neutral?
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dudiobugtron
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Re: Three Eggs.
« Reply #22 on: Aug 27th, 2014, 6:00pm » |
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on Aug 27th, 2014, 6:19am, unkwoop wrote:| How about the eggs have the same density as the water and are buoyant neutral? |
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I like this answer!
The water could also have enough gelatine in it that the eggs stay in place regardless of density.
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rmsgrey
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Re: Three Eggs.
« Reply #23 on: Aug 28th, 2014, 6:36am » |
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on Aug 27th, 2014, 6:00pm, dudiobugtron wrote:
Water has a density gradient with depth, so, assuming the egg-shell is waterproof and non-compressible, having three different float-depths is a non-equilibrium state.
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dudiobugtron
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Re: Three Eggs.
« Reply #24 on: Aug 28th, 2014, 6:07pm » |
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on Aug 28th, 2014, 6:36am, rmsgrey wrote:| Water has a density gradient with depth, so, assuming the egg-shell is waterproof and non-compressible, having three different float-depths is a non-equilibrium state. |
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Assuming the external forces such as gravity act on each glass identically; which they wouldn't in reality because the glasses aren't superimposed. If the glasses are as unkwoop describes but are different distances from the Earth's centre of gravity (which they most likely would be), that could explain the different egg locations.
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