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rho balok / 1000 = (2/3)*v/v
rho balok = 2000/3 = 666,67 kg/m^3
b) rho balok / rho belerang = v'/v
(2000/3) / rho belerang = (7/10)*v/v
rho belerang = 2000*10/21 = 952,38 kg/m^3