Question

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A 5.0 kg block and 4.0 kg of water in a 0.5 kg container are placed symmetrically on a board
that can balance at the center. A solid aluminium block of sides 10 cm is lowered into the
water. How much of the aluminium must be under water to make this system balance?
The density of water and aluminium are 1.0 x 103 kg/m3 and 2.7 x 103
kg/m3, respectively.