How Do You Make A Submarine That Will Float Then Sink Then Float Again In Water Without Touching It?

I have to do a submarine project too. I class they did a demo. Take a paper cup, (not too small) and poke a couple small holes in the bottom. Stick a pencil through the cup so that about an inch is sticking out the bottom. Then in the cup put some weights in (pennies, marbles, ect.) You'll have to experiment to see how much weight you need. Set the sub in the water and it will float, then as a result of the holes at the bottom it will fill with water and sink. When it hits the bottom the pencil will be pushed out of the hole and shoot to the surface. I don't know what the rules are for your project, but I hope this helps!!

Lol what do you mean not touch it ?!!!!

I don't know...I'm having trouble too...ESP the resurfacing...lol

Put flour in a bowl and magic

You get a hollow object, then put baking powder in it. Then put the object in water

How Do You Make A Submarine That Will Float Then Sink Then Float Again In Water Without Touching It?

I'm doing the same think and can't figure it out... Evan my partner is stumped to

I am in the same situation right now and I really have no idea but I did hear that if you use a cone shaped object (that floats) you can out marbles in it enough to make it sink and when it hits the bottom it will tip because of the uneven tip and the the marbles will fall out and the cone will sink again.

Well I'm doing this in science class and I need to right a report how does baking powder make hollow objects float sink then float again????
Please answer by the end of this week!!!:)

Well I'm doing a science project for class and I have no clue how to do anything!!!!!! BY MYSELF!!!!! Write back someone!!!