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## Physics olympics

This is a discussion on Physics olympics within the General Off Topic+ forums, part of the QJ.net Forum Miscellaneous category; So today was my first physics class, and our teacher told us that this term he would give us a ...

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1. ## Physics olympics

So today was my first physics class, and our teacher told us that this term he would give us a project

we have to fill a fairly large fish tank with water, then put 5 paper clips at the bottom

we have to build something that will pick up the paper clips, and then float back up to the top..problem is that we cant use any electronics or use any external controls, so basically when we drop it into the water, its on its own

anyone got any ideas? he said he wouldnt tell us the solution, and nobody figured it out

2. well if im thinking correctly, if you open up the paper clip to take up the most surface area, the surface tension of the water should not allow the paper clip to sink and it will just float at the top....
a good shape would be like a spiral or something of that sort
edit i read your post wrong, my answer obviously doesnt cover what you need... are you allowed to heat up the water?

3. nope..cant heat the water

4. are chemical reactions allowed?

you could rig together some sort of balloon/basket/magnet kind of thing where you put alka-seltzer in a basket with magnets on the bottom... the tablets will fizz up and make the balloon inflate or something. dunno...

5. Can you change the density of the water?

6. Originally Posted by FreePlay
are chemical reactions allowed?

you could rig together some sort of balloon/basket/magnet kind of thing where you put alka-seltzer in a basket with magnets on the bottom... the tablets will fizz up and make the balloon inflate or something. dunno...
Exactly my thinking Mr. Play ;) This is the only solution I could see and I don't foresee any other method of accomplishing this. In order to get all of the clips you would need magnets (that's a must), then you just have to lift it up afterwords - which case balloons that inflate after a few seconds should do the job (figuring how to do that...is your job ;) )

7. Super glue alka seltzer to weigh down a wine cork with a magnet glued to it.

8. Originally Posted by Abe_Froeman
Super glue alka seltzer to weigh down a wine cork with a magnet glued to it.
Good idea, but it's a bit small to pick them all up? you're also adding the weight of the glue, magnet and clips to the corkscrew so will it even be able to rise?

9. after reading these posts..i was thinking something along the lines of having a magnet under a small (very small basket) then having a small balloon with helium attached to the top...then i would fill the bucket with...say..sugar (or something dissolvable but heavier) then the balloon would go up..that way i dont need the alka seltzer to somehow blow the balloon up

10. thats a good idea but sugar is a bad choice, it takes quite a while to dissolve sugar... unless that isnt an issue then thats cool make sure you dont go over the sugar capacity of the water though...

11. Ireland got a bronze WOOHOO!

12. Originally Posted by MiKeY188
Ireland got a bronze WOOHOO!
What the hell are you talking about? Try actually reading the thread instead of spamming it based on the title.

13. I seen title and thought it was the olympics lol ;) Sorry delate it if you want.

14. There has to be a very simple way to achieve this. If there are multiple paper clips at the bottom of this tank, there is no way to navigate any device dropped into it . (Also, how many gallons is the tank and are there aquarium rocks on the bottom?)

15. Originally Posted by Deturbanator
thats a good idea but sugar is a bad choice, it takes quite a while to dissolve sugar... unless that isnt an issue then thats cool make sure you dont go over the sugar capacity of the water though...
time is an issue...what is heavy and dissolves fast?

@ abe...its a fairly large sized fish tank..he hasnt told us how big...and it is empty at the bottom..and as for the paper clips being spread apart...i guess ill ahve to think aabout that

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