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A cylindrical block of length 2l is made...

A cylindrical block of length 2l is made of two different materials. The upper half has density `d_(1)` and and lower half, which is heavier, has density `d_(2)` the block is floating in a liquid of unknown density d with `(l)/(2)` of its length outside the liquid.
(a) Find d
(b) Show that `dgt(4d_(1))/(3)`

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