How can I find the frictional torque in this moment of inertia lab?

[Erickimiscool]

Homework Statement

How much frictional torque is there? I know angular acceleration and torque applied. (I do not know if this can be used to find torque friction, though.)

Homework Equations

The Attempt at a Solution

I know that Frictional torque can be found by doing Torque net - Torque applied. But I do not have torque net, which is another part of the lab where I use the frictional torque found to find the torque net.

 

[Hootenanny]

The net external torque of a rigid body is equal to the product of the angular acceleration and moment of inertia of that body.