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d=25dm=250cm
r=125cm
h=1m=100cm
p=0,8g/cm^3
p=m/V
m=p*V=0,8g/cm^3*(125cm)²*π*100cm=
=0,8g/cm^3*4906250cm^3=
=3925000g=3925kg
F=m*g=3925*10m^2/s^2=39250 N