dau 23 rog de repede
![Dau 23 Rog De Repede class=](https://ro-static.z-dn.net/files/db8/95cbd2f341a41860ddbfdc115f363444.jpg)
ro = p = m/V
p(cauciuc) in medie = 1,25 kg/m3
=> m = pxV = 1,25x0,8 = 1 kg