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?