Two ropes are attached to a circular disk that has a radius of 29.5 m. The ropes are pulled such that they are tangent to the disk. One force is 4.7 N and would cause a clockwise rotation of the disk if it were the only force on the disk. The other force is 30 N and would cause a counterclockwise rotation. What is the net torque on the disk? (Use the convention that a clockwise torque is negative.)