Answer
$F=6.07kN$
Work Step by Step
Knowing that the bouyancy force is:
$F=\rho*g*V$
$V=A*L=\pi*(\frac{D^2}{4})*L=\pi*(\frac{(15cm*\frac{1m}{100cm})^2}{4})*35=0.6185m^3$
$F=1000\frac{kg}{m^3}*9.81\frac{m}{s^2}*0.6185m^3=6.07kN$
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