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Posts posted by beckerman

  1. Well the only other moving component is the water. The water in the cylinder has to move at the same speed as the piston. Since the "external" plumbing can be larger or smaller in volume, the water here could be moving at a different speed. I am thinking that if the components were sized appropriately the piston could descend quite quickly, despite its nearly neutral bouyancy. My reasoning is the 1kg of weight we have only weighs 1kg when the water is stationary. Once the water is flowing it will have a diminishing effect on the 100kg mass. Likewise the increase in weight the mass will be experiencing will apply a progressively increasing amount of force to the water beneath it. Therefore the final velocity would be much quicker than the final velocity would be if the object were thrown into a pool for instance.

  2. Say you have a fitted but freely moving piston falling in a large cylinder. The piston weighs 100kg but only weighs 1 kg under water. The cylinder is filled with water, but there is plumbing going from the bottom of the cylinder to the top. The plumbing is also filled with water. As the piston moves down in the cylinder the water is free to move from beneath it, through the plumbing, and back to the top of the cylinder in a continuous loop.Lets assume the plumbing is of the appropriate shape and design to allow the water to travel as freely as possible. What would the velocity of the piston be after a 20m freefall?

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