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Fluid mechanics sinking barrel
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[QUOTE="haruspex, post: 4727253, member: 334404"] Sea surface pressure will balance the pressure inside the barrel, so you can ignore this for the 'net force'. That in turn means there's no point in converting to atms. Do it all in MKS units. (I think you'll find you've made an arithmetic error.) That said, I really don't like this question. Force is a vector; a net force involves performing a vector sum; the net force acting on the outside of the barrel is zero. Yes, you can take the pressure and multiply by the magnitude of the surface area, but the number that results has no physical meaning. Again, area is technically a vector here, so that multiplication should be done as a vector integral ∫P.dA = P∫dA = 0. It is just possible that this is a trick question and the required answer is zero. [/QUOTE]
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