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**[SOLVED] Easy rotational problem**

**1. Homework Statement**

A string is wound around a uniform disk of radius 0.25m and mass 8.00kg. The end of the string is pulled with a constant force of 50.0 N, and there is a frictional torque acting at the axle of 3.00 Nm.

A) Find the total torque exerted on the disk

**3. The Attempt at a Solution**

I think I have it solved... just wanted to make sure and I have one question. It says that the frictional torque is acting on the axle, do I still use the radius r=0.25 to find the torque for that part? Here is what I did:

[tex]\Sigma \tau = \Sigma Fd[/tex]

[tex]\Sigma \tau = (50)(0.25) + (-3)(0.25)[/tex]

[tex]\Sigma \tau = 11.75 Nm [/tex]

So is that how I would find the net torque?