With Archimedes, what is the buoyancy of 3.9kg iron in water? P the buoyancy of iron is 7.8kg/m3

With Archimedes, what is the buoyancy of 3.9kg iron in water? P the buoyancy of iron is 7.8kg/m3

Known: m iron = 3.9 kg, ρ iron = 7.8 * 10 ^ 3 kg / m3, ρ water = 1 * 10 ^ 3 kg / m3. Find: F floating from the title, the volume of iron block is v iron = m iron / ρ iron. According to Archimedes law, when an iron block is immersed in water, its buoyancy is f floating = ρ water * g * V iron = ρ water * g * m iron /