When we tested our submarine, it almost went straight down, not allowing even a second to be floating, because since the whole were at the bottom, it sucked up the water, increasing the mass, causing the submarine to sink down (Not really balanced forces when first placed in water). At the bottom, the soda can was wiggling and trying to separate with the bottle part, in which did (Balance forces here besides the wiggling,). It did this because the holes brought the water under and around the soda can, pushing it upwards, until the two parts detached, making the can of soda float back up.
To measure the mass of our submarine when floating, we placed it on a triple beam scale to see how much it weighed. The mass of our submarine is 442g. To find the volume, we displaced the submarine in a huge beaker of water, to see how much water it displaced. When we tested, the water went up by 440mL, which is the volume of the submarine. To find the density of the floating submarine, we divided the mass, 442g, by the volume, 440mL. Doing the work, we got a density of around 1g/mL. 
To calculate the density of the sinking submarine, we need the mass and volume again. For the mass, we first submerged the submarine in a beaker of water; then we weighed it again on the triple beam scale, getting a mass of 443.5g. We kept the volume of 440mL and divided 443.5g by 440mL. After working out the problem, we found that the mass of the submarine when sinking was around 1.1g/mL. The amount of buoyant force acting on the submarine was around 400N. We found this by putting our submarine in a large beaker filled with 1000mL of water. The amount of water it displaced, turning out to be 400mL, was our buoyant force.
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