**1. The problem statement, all variables and given/known data**

Hi!

I want to calculate the torque acting on an arm while it is digging something. I only have the formula tau= Fxd. Anyone that know a good formula for this?

**2. Relevant equations**

**3. The attempt at a solution**

tau= Fxd, where d is the length of the link. I can’t go any further

http://ift.tt/1nQ88Oa