torque(with diagram)

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?

Attached Images
File Type: png Untitled.png (16.2 KB)

http://ift.tt/1opzCOL

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