In Concept Physics we are building boats out of aluminum that have to be able to float and not fall over and can hold a large amount of weight. We have a square size piece (half a meter) of aluminum that we must build a boat out of. We may not use any other material. Keep in mind water displacement.
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Pound it into a bowl shape with a bowling ball or a shot put. Make sure that the amount of water that it would take to fill it up weighs more than it does. Then it will float on water when it’s empty.
Weight of water displaced = Weight of aluminum boat
Water is 1,000 kg/m^3 or 1g/cm^3
Hope that helped.