Is the Torque Calculation in the Picture Correct?

[Lorens]

Is the calculation in the Picture incorrect? The reason I believe so is that all the joints are torque free, but then I have been learned in school that you always can calculate the global powers in that way

http://img74.imageshack.us/img74/5212/confused0yi.jpg

 

[civil_dude]

Yes, looks correct to me.