设沙子质量mkg,则
v沙=m/p沙=m/2.4×10³(m³)=m/2.4(dm³)
v水=(40.56-m)/p水=40.56-m
于是m/2.4+40.56-m=40
40.56-40=m-m/2.4
0.56=m-m/2.4
乘以2.4得
2.4m-m=1.344
1.4m=1.344
m=0.96所以1m³的洪水中所含泥沙的质量为
0.96/40x1000=24 (kg)
设沙子质量mkg,则
v沙=m/p沙=m/2.4×10³(m³)=m/2.4(dm³)
v水=(40.56-m)/p水=40.56-m
于是m/2.4+40.56-m=40
40.56-40=m-m/2.4
0.56=m-m/2.4
乘以2.4得
2.4m-m=1.344
1.4m=1.344
m=0.96所以1m³的洪水中所含泥沙的质量为
0.96/40x1000=24 (kg)