L=20см=0.2м
S=4см^2=0.0004м^2
V=0.2*0.0004=0.00008м^3
m=0.00008*1250=0.1кг
P1=800кг/м^3
L1=0.2/2=0.1м
V1=0.1*0.0004=0.00004м^3
m1=800*0.00004=0.032кг
mΔ=0.1-0.032=0.068кг
FΔ=0.068*9.8=0.6664Н
S=4см^2=0.0004м^2
V=0.2*0.0004=0.00008м^3
m=0.00008*1250=0.1кг
P1=800кг/м^3
L1=0.2/2=0.1м
V1=0.1*0.0004=0.00004м^3
m1=800*0.00004=0.032кг
mΔ=0.1-0.032=0.068кг
FΔ=0.068*9.8=0.6664Н