1
F浮+F拉=G
F浮=1.5-1.0
=0.5N
2
V排=50cm^3 (图中给啦50ml=50cm^3)
3
F浮=ρ液gV排
ρ液=0.5/10*0.5*10^-4
=1*10^3kg/m^3