v排=sh=10*10*8=800cm3=8*10^-4m3F浮=p水gv排=1000*10*v排=8Nv木=0.001m3p木=m/v木=0.8/0.001=800kg/m3 漂浮,浮力=G木=8N,m=0.8kgP=Pgh=1000*10*0.08=800Pa
