Posted by Anna on .
The torques acting on the crane boom can be computed about anaxis passing through the top of the boom. (this is the place wherethe spring scale and mass hanger connect to the boom) apply thesecond condition for equilibrium to the crane boom and derivethe resulting equation for the sum of torques about this newpoint

physics 
bobpursley,
What equation?

physics 
Anna,
exactly. This is all I was given. Possibly
SumOf t = T(exp)*length* sin(theta)  W(hang) * length * sin(phi)  W(boom) * L(exp) * sin(phi) = 0
but im not sure.