Answer
$41cm$
Work Step by Step
We know that
$\frac{W}{2}=\frac{mg}{2}=F_B=\rho Vg$
This simplifies to:
$l=\frac{m}{2\rho wh}$
We plug in the known values to obtain:
$l=\frac{75}{2(1000)(0.34)(0.27)}=0.41m=41cm$
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