A spool rests on a horizontal, frictionless surface and you are looking at it from the top view (appears as a circle). In the following questions, the spool is pulled by tension forces that are applied at various locations, directions, and radii. To solve each problem, draw the spool as a circle on a piece of paper and then draw the given tension vectors.

a. A rope of tension 2t applies a force at radius 1r on the spool. it is located at 9 o'clock and points downward. what is the resulting torque in terms of rt?
b. A rope of tension 1t applies a force at radius 1r on the spool. it is located at 12 o'clock and points right. what is the resulting torque in terms of rt?