Question

10cm3的铁和40cm3的铝制成合金,则合金密度是________.(ρ铁=7.9×103kg/m3,ρ铝=2.7×1

Answer 1

ρ铁=7.9×10^3kg/m^3=7.9g/cm^3,ρ铝=2.7×10^3kg/m^3=2.7g/cm^3

ρ=m/v,m=ρ×v

总质量m=ρ铁×v铁+ρ铝×v铝=7.9×10+2.7×40=187g,

总体积v=v铁+v铝=10+40=50cm^3

合金密度ρ=m/v=187g/50cm^3=3.74g/cm^3=3.74×10^3kg/m^3.