Balloon over rock in a pond?
925016
This is a trig question.  I won't answer it, but will help you set up the problem. \n\n Draw a picture with a triangle one side that is 2000 ft high and one angle (I leave it to you to figure out which one and where the rock and baloon are) is 22.3333 degrees. You also have a right angle there someplace.  Angle-side-angle theorem means the triangle is uniquely defined. You can use an inverse trig function to calculate the distance from the balloon to the rock along the surface. You can also use the "sine law" of Algebra if you are not supposed to use inverse trig functions, though you have to find the subtent of the third angle (trivial if you remember one fact about triangles).
972209
a balloon filled with petrol next to some wire wool....that should do it
252576
I've never tried this or heard of it being done, so ask your teacher if it's safe to try this experiment. Take a balloon that has a good long neck on it and force it into the tab opening of an empty aluminum soda can. Then blow the balloon up as hard as you can so that it expands to fill the inside of the can and forces all the air out of the empty can (which really wasn't empty because it had air in it!) Continue to pinch off the neck of the balloon with your fingers so the air won't come out of the balloon. Now fill up a big tall kitchen pot or the sink half way and turn the aluminum soda can upside down completely into the sink or pan of water until the top of the can and pinched off balloon are partially submerged under the water. Now start letting the air out of the balloon gradually and watch the bubbles come to the surface of the water. When all the air is out of the balloon, it still has atmospheric air pressure inside it which keeps the can from being crushed by the atmospheric air pressure of the air in the room above the water level. So try to pull the balloon out of the soda can gradually while making sure to keep the soda can tab and balloon openings under the water level. Results? Does the can get crushed by atmospheric air pressure? Of course, we always have about 14.7 pounds per square inch of atmospheric pressure at sea level. You may have to experiment with different container types that your teacher says are safe to experiment with and one that had the globular shape of a blown up balloon would allow the air to be pushed out fully. You should wear good safety glasses in case any other container (like thin plastic) rather than the aluminum container shatters in the process of imploding.\n \nPS,  Using a wider mouth container, like the aluminum soda can with it's top sawed off, you could pull the balloon out quickly even when it was blown up with air. Don't cut yourself on any sharp metal edges though. The metal or plastic container material can't be too strong and thick because it can't collapse easily then under the force of the atmospheric air pressure.
629282
assuming the balloons are spherical and have no mass and the temperature is about 25 C then 418 balloon might just do it.
397410
use a CD and the top of a soda bottle (both the cap and the very top) glue the cap to the CD (you need a VERY small hole in the cap) and put the balloon on the very top of the bottle, use that to blow the balloon up
212962
Put a white plastic poker chip in it, and push it towards the center until you can't see it. (Or, heat a paper clip up over a candle, melt three holes near the edges of the poker chip, tie it so that it will lie flat, not edgeways, lower it into the water on a string.)  Measure the depth at which you lose sight of it. That will tell you how clear the  water in the puddle is. You may have to tape a penny to the back to give it weight.\n\nIn some mountain lakes, you can see it 30 feet down. In some catfish farms, it vanishes at 4 inches.\n\nIf the puddle is deep enough, use a Frisbee, but use duct tape instead of melting holes in it. The trick is getting the string tied so that the disk is flat, not sideways.
1124055
drain the pond no water no frogs
726772
Its a trick Q...\n1. If floating on Surface, then 0 (since ur ballon is massless, although theoretically, nothing is massless..)\n2. If forced to stay inside water, then it would be equal to the weight of water displaced (i think ur Q is phrased wrongly, it is 1000cm3 displaced water ( or else the answer depends on the volume of the balloon).. Or simply, it is equal to the force used to keep the balloon inside water.
912055
Then I think you should find a pond and start looking. Failing that, start doing your own research instead of expecting us to do it for you. However, here's some help:\n\n1. George is a living organism in my pond. He plays the clarinet and wants to be an accountant.\n\n2. Martha is another living organism in my pond. She likes classical music and watching game shows on television.
817948
My science class did the same project a few years ago. I suggest suspending the egg within a sphere, try making wings to slow its fall. I dont think whether it is a trianlge or not will really affect its streght to much. Good luck
1184397
You MIGHT try putting some limestone gravel in it, and letting the rocks turn to salts.
69693
We bought one at Walmart...it was 200 (last summer) and lasted all year, with no holes or problems.  We used it tons and had lots of kids jumping in & around it.  Plan on bringing it out again soon!\n\nHappy swimming!
441196
Build a mini trebuchet!  Build a mini trebuchet!\nGive egg LOTS and LOTS of padding!
258557
a plane , viabrator, and unlimited water
909914
You're best off using fishing wire rather than string but you won't need a frame. Make sure the balloons are evenly spaced and tether them well at both ends.
172924
The simple way is to make a solor still. Dig a hole, fill with some salt water.  Take some plastic (big enough to cover hole) Weigh it down around the edges so that it wouldn't move or blow away leave a hint of slack in it.  Put a smal rock in the middle.  Put a can/cup ect under the rock. As the water evaporates it will collect on the plastic, on drip from where the rock is.  Drips fall in cup.  Fresh water.  You can boil sea water and cool steam, collect drips in bucket.
248507
hot glue might hold depends on the size of the rocks... it is water proof