1 and a half
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No.
The weight of the displaced water is 2/3 the weight of the brick. So the weight of the brick is 3/2 the weight of an equal volume of water ... just another way of saying that the density of the brick is 1.5 gm/cm3.
1375 kg/cum
Anywhere in the universe where there was some net gravitational force: however weak or strong.
How big is the block and how big is the brick?