Torque question

1. The problem statement, all variables and given/known data
http://ift.tt/1hRPsZr

Why does the force system produce no torque about O
don’t mg and N produce a torque about O?

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

http://ift.tt/1fcfl99

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