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Bouyancy, capillary action. HELP PLEASE

  • Thread starter newmessiah
  • Start date
1. Homework Statement
so i have an to do an EEI for an assignment due this friday. My experiment involves me putting a rounded bowl with a flat bottom and a hole in the center on the bottom onto some still water and testing how the bowl sinks faster as weight is added to the bowl. The water comes up through the hole in the bottom of the bowl, filling it from the bottom, faster as i add more weight. i am assuming this is because i am displacing more water as weight is added so there will be a greater buoyant force acting upwards but i don't fully understand why the water is coming up through the hole. is the buoyant force spread equally along the whole bottom of the bowl making it come through the hole because there is nothing solid to stop it from coming upwards (can i work out how many newtons of force are making the water come up through the hole, if i measure the area of the bottom of the bowl/the volume of displaced water etc.)
are there any other physics concepts i need to know other than Archimedes' principle to fully understand this phenomenon?...any background theory information will be greatly appreciated! Thanks


2. Homework Equations

buoyant force = weight of fluid displaced
 

SteamKing

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Bowl + Hole in bottom = Sinking Bowl
 

Redbelly98

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Welcome to Physics Forums newmessiah :smile:

Well, the water pressure increases with depth. The hole is at some depth, below the top surface of the water. Something along those lines should probably come into your explanation.
 
thanks for that!
do you know if the total bouyant force would be spread equally over the base of the bowl?
 

Redbelly98

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do you know if the total bouyant force would be spread equally over the base of the bowl?
Well, the buoyant force comes from the pressure being different at different water depths (higher pressure at deeper depths). Is the base of the bowl all at the same depth?
 

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