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Well it doesn't weigh 10 lbs! Ordinarily, a brick would be considered incompressible, and that is still probable in 5000 ft of water. And assuming that it had no entrained air!
BUT, water at 5000 ft is compressible (for which you'll have to look up an hydrology table) and the volume of water displaced by the brick will now weigh more than that volume would have had at the surface.
And as soon as you have immersed your brick, it will weigh less than it previously did, by the weight of water it displaced. remember Archimedes?
SO your brick would now be slightly more buoyant (weigh less) than it did close to the surface.
In an exam answer, one would usually say 'assuming the brick is incompressible', and 'assume the brick is impermeable'. Of course you could also 'assume that water is incompressible', and eliminate the hydrology tables!
Then proceed with the answer.
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