Calculating Net Torque for Disk in Diagram D

[nahanksh]

Homework Statement

http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/sp08/fig10.gif

What's the net torques about the pivot, represented by the dot (•), in the diagram D. The solid arrows represent the magnitude and direction of the forces applied to the objects.

Homework Equations

The Attempt at a Solution

I thought it's just F0 multiplied by R but it turns out to be wrong..

Should something be considered if it's disk?
(Because i have seen only the cases of rod getting torques)

What's wrong in my thought?
Please help me out here.

 

[PhanthomJay]

Your magnitude of the torque is correct, but since Torque is a vector, you must also specify its direction. Is it clockwise or counterclockwise, (or, using by convention the right hand rule, pointing into the page or out of the page)?