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so i have to find/make something from around my house
that if i put it in a tank of water..it will sink to the bottom of the tank ..and stay there for least 3seconds...then float back up...
any ideas??? thanksss so much (link)
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i have a good one. you'll need a float, somthing very buoyant, like an empty soda bottle or something else with a good amount of air in it. you'll also need a weight...somthing metal, or a bag of sand...anything heavy. then you need toilet paper. twist the toilet paper into little ropes then twist those little ropes together untill you have a thin "rope" strong enough to hold your weight up. tie the "rope" to the weight and the float(you can use duct tape on the ends of the rope if your having trouble tieing it.)
when its all together the whole thing will sink, but when the toilet paper rope gets wet it weakens, the pull of your float should be enough to break the rope and alpw it to float back up.
i hope that helped, good luck.
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