Răspuns:
72km/h 3500g/dm^3 1500kg/m^3
Explicație pas cu pas:
b) 20m/s=20*(1/1000)/(1/3600)=20*3600/1000=2*36=72km/h
(1 metru=1/1000 km, 1 secunda=1/3600 ore)
c)3500kg/m^3=3500*(1000/1000)=3500g/dm^3
(1m^3=1000dm^3, 1kg=1000g)
d)1.5g/cm^3=1.5*(1/1000)/(1/1000000)=1.5*1000000/1000=1.5*1000=1500kg/m^3
(1cm^3=1/10^6 m^3, 1g=1/1000 kg)
