Our redesign for our submarine works because the weights of the magnets allow the submarine to sink. Once the plastic with the magnets slides off the coke bottle, it causes the can of diet coke to float since it is less dense than the water it is put in. When our group tested the submarine it sunk fast, but took a while to float back up. This happened because the length of the plastic bottle that was cut in half was too long which caused the bottle to float up very slowly.
To measure the mass of our submarine we used the triple beam scale. After using the scale, we found that our submarine’s mass was 443g. To calculate the volume of our group’s submarine, we used a large graduated cylinder with 1000ml of water inside and placed the submarine into, making the water rise up by 440ml, which is the volume of the submarine when floating. We found the density of the submarine when floating by dividing the mass, 443g, by the volume, 440mL, and got 1.01g/mL.
To calculate the density of the submarine when sinking, we measured its mass when sunk using the triple beam balance, which turned out to be 500g, and its volume, 440mL again. Finally, we divided 500g by 440mL to find the density of our submarine when sinking, giving us 1.14g/mL.
A submarine floats when it’s density is less than the liquid it is put in, such as a submarine with a density of 0.2g/mL being put into water with 5g/mL as its density. This can be done by increasing the submarine’s volume, where its greater than its mass, allowing more buoyant force to push up due to the submarine taking lots of space. Another way to make a submarine float is by decreasing the mass of the submarine. In order to sink a submarine, our group would have to increase the mass of the submarine or decrease its volume, which allows gravity to push a lot stronger than the opposing buoyant force. To cause a sunken submarine to float again we’d have to decrease the mass or increase its volume. This will make the submarine less dense than the surrounding liquid, allowing to it float back up to the surface.
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