A cylindrical block of length 2l is made of two different materials. The uppwer 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)`

Answer

(a) `d=(2)/(3)(d_(1)+d_(2))`