G球=19.6N
m球=G球/g=19.6/9.8=2Kg
V铁=2/7900=0.000253
F浮=G-F=19.6-14.4=5.2N
F浮=ρ水gV排
5.2=1000*9.8*V排
V排=0.000531m3
V空=0.000531m3-0.000253=0.000278
G球=19.6N
m球=G球/g=19.6/9.8=2Kg
V铁=2/7900=0.000253
F浮=G-F=19.6-14.4=5.2N
F浮=ρ水gV排
5.2=1000*9.8*V排
V排=0.000531m3
V空=0.000531m3-0.000253=0.000278