A ship of displacement A = 15000 t is underway in a fresh water lake, a central %3D fuel tank of breadth b = 10 m and length I = 8 m became partially filled during voyage as the fuel is consumed with pi = 650 kg/m³. Assuming the liquid surface does not change as it rolls to a small angle. Calculate the reduction of the GM due to the free surface.

A ship of displacement A = 15000 t is underway in a fresh water lake, a central %3D fuel tank of breadth b = 10 m and length I = 8 m became partially filled during voyage as the fuel is consumed with pi = 650 kg/m³. Assuming the liquid surface does not change as it rolls to a small angle. Calculate the reduction of the GM due to the free surface.