圆柱形容器底面积为220cm²,高为8cm,内放一边长为5cm的正方体冰块,如图所示,已知冰的密度为0.9×103kg/m3.求: (1) 冰对容器底的压强; (2) 冰熔化后,水对容器底的压强 拜托了.
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![圆柱形容器底面积为220cm²,高为8cm,内放一边长为5cm的正方体冰块,如图所示,已知冰的密度为0.9×103kg/m3.求: (1) 冰对容器底的压强; (2) 冰熔化后,水对容器底的压强 拜托了.](/uploads/image/z/10932952-40-2.jpg?t=%E5%9C%86%E6%9F%B1%E5%BD%A2%E5%AE%B9%E5%99%A8%E5%BA%95%E9%9D%A2%E7%A7%AF%E4%B8%BA220cm%26%23178%3B%2C%E9%AB%98%E4%B8%BA8cm%2C%E5%86%85%E6%94%BE%E4%B8%80%E8%BE%B9%E9%95%BF%E4%B8%BA5cm%E7%9A%84%E6%AD%A3%E6%96%B9%E4%BD%93%E5%86%B0%E5%9D%97%2C%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%B7%B2%E7%9F%A5%E5%86%B0%E7%9A%84%E5%AF%86%E5%BA%A6%E4%B8%BA0.9%C3%97103kg%2Fm3.%E6%B1%82%EF%BC%9A+%EF%BC%881%EF%BC%89+%E5%86%B0%E5%AF%B9%E5%AE%B9%E5%99%A8%E5%BA%95%E7%9A%84%E5%8E%8B%E5%BC%BA%EF%BC%9B+%EF%BC%882%EF%BC%89+%E5%86%B0%E7%86%94%E5%8C%96%E5%90%8E%2C%E6%B0%B4%E5%AF%B9%E5%AE%B9%E5%99%A8%E5%BA%95%E7%9A%84%E5%8E%8B%E5%BC%BA+++++++%E6%8B%9C%E6%89%98%E4%BA%86.)
圆柱形容器底面积为220cm²,高为8cm,内放一边长为5cm的正方体冰块,如图所示,已知冰的密度为0.9×103kg/m3.求: (1) 冰对容器底的压强; (2) 冰熔化后,水对容器底的压强 拜托了.
圆柱形容器底面积为220cm²,高为8cm,内放一边长为5cm的正方体冰块,如图所示,已知冰的密度为0.9×103kg/m3.求: (1) 冰对容器底的压强; (2) 冰熔化后,水对容器底的压强 拜托了.
圆柱形容器底面积为220cm²,高为8cm,内放一边长为5cm的正方体冰块,如图所示,已知冰的密度为0.9×103kg/m3.求: (1) 冰对容器底的压强; (2) 冰熔化后,水对容器底的压强 拜托了.
(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