一块重力为25牛的砖,长0.2米,宽1分米,厚5厘米,砖放在水平地面上对地面的压强最大是几帕,最小几帕.
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一块重力为25牛的砖,长0.2米,宽1分米,厚5厘米,砖放在水平地面上对地面的压强最大是几帕,最小几帕.
一块重力为25牛的砖,长0.2米,宽1分米,厚5厘米,砖放在水平地面上对地面的压强最大是几帕,最小几帕.
一块重力为25牛的砖,长0.2米,宽1分米,厚5厘米,砖放在水平地面上对地面的压强最大是几帕,最小几帕.
P=F/S=G/S,
竖放时,S=S1=1dm*5cm=0.1m*0.05m=5*10^^-3m^2 最小,P最大
此时 P=P1=25N/(5*10^-3m^2)=5*10^3pa
平放时,S=S2=0.2m*1dm=0.2m*0.1m=0.02m^2,S最大,P最小
此时 P=P2=G/S2=25N/0.02m^2=1.25*10^3pa
长=0.2米 宽=1分米=0.1米 厚=5厘米=0.05米
最大帕斯卡:P=F/S
=25N/0.1m x 0.05m
=5000P
最小帕斯卡:P=F/S
=25N/0.2m x 0.1m
=1250P
求出板砖的最大面积和最小面积
最大面积得:Smax=0.2*0.1=0.02m²
最小面积得:Smin=0.1*0.05=0.005m²
Pmax=F/Smin=25/0.005=???
Pmin=F/Smax=25/0.02=???
拿分来= =
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