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Originally Posted by Letum
I think you might be confusing mass and weight.
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Possibly. It wouldn't be the first time.
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When any boat is not sinking or rising it's weight is zero because the
mass of displaced water is equal to the mass of the boat.
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So if a diver came upon the submerged sub, he would be able to push it as if it wasn't there? Or if a fisherman snagged it he could just reel it in? That doesn't sound right to me. The thing still has the same mass, and any attempt to hook it is going to meet with that many tons of resistance.