bonjour
1/ V=4*1*50=200 cm³
m=12g
ρ = m/V = 12/200=0.06g/cm³=6*10⁻² g/cm³ =6*10⁻⁵kg/cm³=6*10⁻¹¹ kg/m₃
2/ V=4³=64 cm³
m=503g
ρ=503/64=7.86 g/cm³=7.86*10⁻⁹ kg/m³
3/ V=π*1²*3=9.43 cm³
m=202g
ρ=m/v = 202/9.43=21.43g/cm³=2.143*10⁻¹g/cm³=2.143*10⁻¹⁰ kg/m³
4/ V=π*(4/2)³*4/3 =33.5 cm³
m=151g
ρ=m/V = 151/33.5=4.51g/cm³=4.51*10⁻⁹ kg/m³
5/ V=5*2*1=10 cm³
m=193g
ρ=m/V = 193/10=19.3g/ cm³=1.93*10⁻¹g/cm³=1.93*10⁻¹⁰kg/m³