（1）5cm=0.05m
V冰=0.05^3m=1.25×10^-4m^3
S冰=0.05^2m=2.5×10^-3m^2
m冰=ρ冰V冰=0.9×10^3kg/m^3×1.25×10^-4m^3=0.1125kg
冰对容器底的压力F=G冰=m冰g=0.1125kg×10N/kg=1.125N
冰对容器底的压强P=F/S=1.125N/2.5×10^-3m^2=450pa
(2)S器=220cm²=0.022m^2
冰块全部熔化成水后,V水=m水/ρ水=m冰/ρ水=0.1125kg/1×10^3kg/m^3=1.125×10^-4m^3
容器中水深度h=V冰/S器=1.125×10^-4m^3/0.022m^2=0.005m
水对容器底的压强P=ρgh=1×10^3kg/m^3×10N/kg×0.005m=50pa