The problem is attached. I’m trying to do 2.a), which asks for the net torque on the loop. I’ve obtained the following values of forces: [itex]F_{PQ}=0N, F_{PR}=12N[/itex] in to the plane, [itex]F_{QR}=12N[/itex] out of plane. But I don’t know how to calculate the net torque if the loop is pivoted about an axis that lies along side PR. I know the torque is Frsinθ, but what are r and θ in this case?

http://ift.tt/1eummO1