Torque while digging

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

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