Two forces are applied to a merry-go-round with a radius of 3 m as shown in the following diagram. One force has a magnitude of 90 N and the other a magnitude of 40 N. Take the torque caused by the 90-N force to be positive.



What is the torque about the axle of the merry-go-round due to the 40-N force? (You must provide an answer before moving to the next part.)



The torque about the axle of the merry-go-round due to the 40-N force is
N·m.