(1)∵木块漂浮,F浮=G,∵F浮=ρ液gV排,G=mg=ρgV,∴ρ水g 3 5 V=ρ木gV,ρ木= 3 5 ρ水=0.6×103kg/m3=0.6g/cm3;(2)F浮′=G,ρ液gV排′=ρ木gV,ρ液g(1- 1 3 )V=ρ木gV,ρ液= 3 2 ρ木= 3 2 ×0.6×103kg/m3=0.9×103kg/m3;故答案为:0.6;0.9×103.