Question

 A 150mm-diameter hollow sphere weighing 300 N is attached to a solid concrete block weighing 5.3 kN. If the concrete has a specific weight of 27.7 kN/m³, what will be the state of the two objects together in water?      

Answer 1

$F_B=\rho gV=1000\cdot9.8\cdot(4\cdot3.14\cdot 0.075^3/3)=17.3\ (N)\ll300\ (N)$

...

The two objects together will drown under the action of gravity.