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

Attachment 68238

a) What is the length, rmr_m, of the moment arm of the force F→F_vec about point p?

b) Find the torque τtau about p due to F→F_vec. Your answer should correctly express both the magnitude and sign of τ.

**3. The attempt at a solution**

a) I’m inclined to state the answer as -rsinΘ but apparently the answer is r sin Θ.

Is there a reason why the sign is positive?

http://ift.tt/1opzCOL