UPSB v4
Off-topic / Physics project: walk on eggs experiment
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Date: Sat, Jan 15 2011 23:12:14
so i was wondering if anyone knew how to make a 15 cm by 15 cm by 15 cm insulation box. i have to make one for school. any suggestions on how i can make a good box?
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Date: Sat, Jan 15 2011 23:17:21
what kind of insulation? heat? sound? electricity?
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Date: Sun, Jan 16 2011 00:11:29
do u know how to make a sound insulation room?
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Date: Sun, Jan 16 2011 00:39:57
strat1227 wrote: what kind of insulation? heat? sound? electricity?
@strat1227 heat -
Date: Sun, Jan 16 2011 00:49:23
@Morpheus i mean sound isolation
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Date: Sun, Jan 16 2011 00:51:15
exclusive wrote: @Morpheus i mean sound isolation
nope idk how to make a sound iso room, but i need help on how to make an insulation box :) -
Date: Sun, Jan 16 2011 00:53:42
so is this like a cooler?
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Date: Sun, Jan 16 2011 01:51:33
@Awesome i basically have to see how hot i can keep a beaker with hot water (150 mL) for a certain amount of time
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Date: Sun, Jan 16 2011 01:54:28
take a box, get some insulation, like for your house, fill it up with it, put a whole bunch on the lid etc., clear out just enough space for a beaker to fit in the middle of it and you should be good.
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Date: Sun, Jan 16 2011 01:57:02
should i use 2 layers of glass for the walls? or just stick with cardboard or something else?
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Date: Sun, Jan 16 2011 02:12:02
you also need to tell us what materials you have available/permitted to use
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Date: Sun, Jan 16 2011 02:14:00
glass is only good really if you can form a vaccuum or something, which i doubt you can do i'd just use a thermos lol
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Date: Sun, Jan 16 2011 03:16:25
@k-ryder i can basically use anything, as long as the size isnt bigger than 15x15x15 cm
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Date: Tue, Jan 18 2011 19:54:00
What are the constraints on the materials you're allowed to use and budget? How are you being graded on the effectiveness of the cooler? In direct reply to the above post, multiple layers of cardboard to me would seem to be a better choice: 1. Cheaper 2. Easier to work with/manipulate 3. Better(?) insulator The key thing here is to remember to dispel the thought that "insulators keep things warm". Insulators are better defined as materials that are poor at the facilitation of something being transferred. In this case it's not heat getting out, but heating seeping in. Dense solids like glass make good conductors since the particles are spaced closer together, allowing energy transfer in the form of heat to pass through more easily. With something like cardboard, it's not very dense and has air pockets and gaps, which are poor conductors, which conversely translates to a good insulator. Now for some other materials, I'd suggest you get one of those heat shields that people put in their windshields in the summer. Line the inside of your cooler sort of like how some lunch boxes are made. Also minimize the size of your box to reduce the amount of surrounding air around the object you're going to be insulating. The reasoning here is that when you're about to put something in the box, there will be some warmish air existing in the box. By reducing the overall capacity, there will be less warm air to heat up your object. Also if you can before evaluation, try to keep your actual box in a cold place and keep something cold like an ice pack inside. It can only help :) I had a similar project in elementary school and got a mediocre mark, but over the years and learning more about science in general, I've come up with these suggestions that would have helped my own project and should probably help yours.
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Date: Tue, Jan 18 2011 22:24:05
Morpheus wrote: should i use 2 layers of glass for the walls? or just stick with cardboard or something else?
just stick with a carboard box, since you aren't dealing with wind or anything all you need is an insulator, the most cost effective stuff is used in houses (you need a lot of it and it needs to be good, lots of engineering goes into that kinda stuff) just use that, its all you need, more the better, the only concern is if the beaker is hot enough it could melt it, but you can just line where the beaker is going with an oven mit or something. The simplest solution is best, do what strat said, if it fits the criteria. -
Date: Wed, Jan 19 2011 04:09:05
k, thanks guys for all the help
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Date: Sat, Feb 12 2011 00:31:41
bummmping this thread up. I have a new project! so..any advice on how i can walk on eggs without breaking them?
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Date: Sat, Feb 12 2011 00:36:03
Use a shit load of eggs and big shoes. OR Use qi.
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Date: Sat, Feb 12 2011 00:45:21
snowshoes p=f/a so if you increase area you decrease pressure on the eggs
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Date: Sat, Feb 12 2011 01:30:17
...And hard boil the eggs.
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Date: Sat, Feb 12 2011 01:31:46
strat1227 wrote: snowshoes p=f/a so if you increase area you decrease pressure on the eggs
i have to make my own shoes though... -
Date: Sat, Feb 12 2011 01:33:08
Just tape some cardboard to some shoes, making sure the cardboard is bigger than the area of your shoe. Use loads of eggs too. As a last ditch, try dieting. ;)
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Date: Sat, Feb 12 2011 01:33:59
ok so just go buy plywood. make the shoes as huge (but still light) as possible or better yet, just buy a huge piece of plywood and lay it down over all fo the eggs then you should be able to walk around on the plywood no problem
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Date: Sat, Feb 12 2011 01:35:11
cardboard wont work it has to be a material that will distribute the force evenly over the whole area, cardboard bends
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Date: Sat, Feb 12 2011 01:38:42
I didn't mean the kind of cardboard you make a cereal box out of... :lol: Anyways, I did a quick bit of Googling. Google reckons an eggs can take 10 pounds of weight if added gradually. So if you take 6 eggs for every 1 stone of your body weight, you should be fine. Just make sure you can apply your weight gradually. Don't jump on them! :p That's about 30 seconds of Google though, you might want to check. :rofl:
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Date: Mon, Feb 14 2011 01:59:31
strat1227 wrote: ok so just go buy plywood. make the shoes as huge (but still light) as possible or better yet, just buy a huge piece of plywood and lay it down over all fo the eggs then you should be able to walk around on the plywood no problem
wait strat, if the guy's foot is like a size 8, and the dimensions of the box of eggs is 30 cm by 17 cm, and you put the "shoe" in the middle of the plywood, won't that cause there to be more pressure where his foot pressing on? -
Date: Mon, Feb 14 2011 02:35:25
@Morpheus no not if you consider the wood to be rigid. obviously wood bends some, but it doesn't bend very much, if you put a force (your weight) in the middle of the wood it spreads that force out over its entire surface
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Date: Mon, Feb 14 2011 23:03:14
strat1227 wrote: @Morpheus no not if you consider the wood to be rigid. obviously wood bends some, but it doesn't bend very much, if you put a force (your weight) in the middle of the wood it spreads that force out over its entire surface
o wow..sry strat,i just found out i cant use wood D: ...so should i stick with styrofoam? -
Date: Mon, Feb 14 2011 23:07:07
dunno, depends on your weight i guess, if i stepped on a piece of styrofoam my foot would just go right through it lol the lightest material that's still rigid will be best. clearly something like carbon fiber would be ideal but that'd be expensive
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Date: Mon, Feb 14 2011 23:10:39
lol, my partner is going to walk on the eggs and he weights like 80 lb, so that might be ok
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Date: Tue, Feb 15 2011 00:27:48
Why not alternate different layers of material? Like Styrofoam > Cardboard> Styrofoam. Or whatever other materials that you could think of.