o bucata de lemn de brad cantareste 750g.Cat cantareste o bucata de fier care are acelasi volum.CP brad =600kg/m3;PF=7860 kg/m3.Urgent,dau coroana

Răspuns :

mb=750 g=0,75 kg
ρb=mb/V
V=mb/ρb=0,75/600=0,00125 m^3
ρf=mf/V
mf=ρf*V=7860*0,00125=9,825 kg