Quote:
Originally Posted by Hunters Pa
If anything the kayak would ride slightly, but barely, lower. The kayak and its contents must displace a volume of water equal in weight. The addition of the noodles would add to the weight of the assembly with change to the exterior configuration of the body displacing the water.
Now, if you placed noodles UNDERNEATH the kayak instead of INSIDE, then the noodles would have net buoyancy due to their volume displacing the water, which weighs more per unit volume. The kayak would be lifted to the point that less water is displaced by the hull in the amount almost equal to the total volume of the noodle.
The reason for putting the noodle inside your kayak for safety is, if the hull fills with water, the kayak hull is no longer displacing the water beyond the volume actually occupied by plastic. The noodle inside the hull takes over displacing a smaller volume of water than the hull, but enough to keep the kayak from heading to the bottom.
think of it this way, if you are in a swimming pool and have a pool noodle, do you float higher when you hold the noodle over your head? No, because it is not displacing any water BUT it is contributing a small amount to the "assembly" of your body and the noodle. When you sit on the noodle it is submerged. The weight of the assembly has not changed, but WHAT is displacing the water HAS changed.
Sorry for the long-winded answer, but this is a pretty common misconception and the answer is not necessarily intuitive.
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Holy cow Bill Nye! Nice science report.
In regards to science, I'm still trying to figure out this whole flat vs globe earth
[emoji38]
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