I have to get a pallet expander... sooo does it hurt when its being put in because i heard it does.And does it hurt afterwards?? Thanks!!! :) :D
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You need to use Archimedes' principle - buoyancy force is equal to the weight of water displaced. If you want to make a raft which has a total mass of M, you must arrange for the displaced volume of water to have a mass of M also. The displaced volume is the volume of the submerged part of the raft. If this is the bottles only (the rest of the structure being above water) then the total volume of the submerged bottles (Vt) , measured in litres, will be numerically equal to the total mass of the raft measured in kg. This equality arises from the fact that the mass of 1L of water is 1kg. In the case of your raft this leads to Vt = 60 + Mb Litres, where Mb is the total mass of all of the bottles when empty. Note that Vt is the total overall (external) volume of the bottles, which will be greater than the volume of their contents. If we neglect this detail, and also the mass of the bottles we get the approximate answer 60 L as a minimum value for the submerged volume. With 25 L you will be able to make a raft in which the pallet is well above the water surface when unloaded. But it will sink if you step on it, since it will be able to support an additional mass of only 25 - 10 = 15 kg before becoming water-logged. It might be better to ditch the bottles (particularly if they are small ones) and think in terms of larger buoyancy chambers such as oil cans or very large plastic bottles such as those used in drinking fountains.
