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Fw=40N
ρ=1000kg/m³
g=10m/s²
Fw=V×ρ×g
40N=V×1000kg/m³×10m/s² |:1000kg/m³×10m/s²
V=0,004m³
ρ=m/V
ρ=7kg/0,004m³
ρ=1750kg/m³