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quote:Originally posted by PrecursorOk first you said that those on the inside and those on the outside would be balanced and therefore not go anywhere. That is wrong.
quote:Now you say that the buoys inside would get held back by the ones on the outside falling.
quote:Oh dear; can you not see that your 'tube' filled with water is almost exactly the same as a 'hosepipe' with sealed inner sections, which I used as an illustration in a previous post? It does not work!!
quote:Nice illustration, btw
quote: So since this ferrofluid resists the force of gravity using the magnets
quote:LOL oh my. So the buoys would be weightless would they? That if they weren't tied down they would float away? I suppose those big steel buoys found in high traffic boating areas must be weightless too if they can float.
quote:Take a 10 lb weight and put it on the bottom of a pool. Add a buoy that has a buoyant force of 3 lbs. The weight will keep the buoy down. Add two more and the weight will keep all three down. Add a fourth and the weight will be lifted to the surface. The buoyancy of the buoys adds together. The weight will be lifted off the bottom with an upwards force of 2 lbs. So no it's not the same thing. The buoys individually will have buoyancy and when linked together they combine their efforts. Yes buoyancy is when you have something that is less dense submerged in something that is more but for the example you gave the difference as to why one would work and not the other is the trapped air. More specifically it's specific gravity. Water has a specific gravity of one; anything will less will float and anything with higher will sink.
quote:First it's called life experience. I live next to the ocean and have been swimming my entire life and I can tell you that the wheels would have such little resistance that the weight of just one buoy would be enough to turn them.
quote:As for trying to open a hatch with ten feet of water above it, as long as that ten feet only has a diameter of two feet then opening the hatch would require some effort but is more than possible.
quote:More specifically it's specific gravity. Water has a specific gravity of one, anything will less will float and anything with higher will sink.
quote:Also look how big your big steel shipping buoys need to be to attain the required internal volume in order for them to have a lower density than the water their displacing due to their dry weight and for your design to revolve any buoys incorporated in it would need to be small and slim line otherwise your going to have a nightmare trying to design the components which the buoys have to pass through or over .
quote:You can’t use gravity to overcome your friction loses as the buoys will then be to heavy to be buoyant.
quote:And how many of them large steel shipping buoys do you think will be needed to lift the dry weight of the four in your drawing that are rising and are not in the water
quote:you’re not lifting buoys in water as they are lifting themselves. what you have to lift is the dry weight of the buoys that haven’t entered through the seal yet and the buoys which have exited the water but haven’t reached TDC yet.
quote: Try it.
quote:I think you will find that the specific gravity of water changes with its temperature.
quote:specific gravity, ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the two substances.
quote:by the magnet pulling up on the fluid with more force than gravity pulls down causes the object to not be bouyant. It doesn't need to "stop" gravity or whatever you were suggesting I was saying. In this case the ferrofluid is suspended in the air, more than counteracting the force of gravity, which caused the bouyancy in the first place. To elaborate, lets say you had a cup full of ferrofluid, a magnet on the bottom which pulled the ferrofluid twice as hard as gravity. If you measured the bouyant force, when the cup was upside down, the force would be negative, or the object would move downwards against gravity, if you turned it rightside up, the bouyant force would be three times the usual all upward acting.
quote:with this ferrofluid design of spillage. Bottom line youve got to forces. the magnet and gravity which ever one is stronger is where the ferrofluid would hang out, slanting towards the weaker force, it has no reason to spin or start spinning.