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Sorry, just noticed Q1_1_1: 3/2*rho*g*A is WRONG! It is 0.5*rho*g*A as trustee says.
These are my results (done by me): Q1_1_1 rho*g*A 3/2*rho*g*A Q1_2_1 400 500 700 565.685424 Q1_2_2 -800 -300 0 700 Q1_2_3 ((W*1.25)*(5/3*H))/(A_0*E_0) need the rest...
If you don't understand the solution then you have to read the exercises at least.
