V2=(3*a)^3=27*a^3=27*V1
S2=(3*a)^2=9*a^2 =9*S1
S2_=6*(3*a)^2=9*6*a^2=9*S1_
Fарх.=F1-F2
Fарх.=8н-3.4н=4.6н