[SOLVED] Easy rotational problem 1. The problem statement, all variables and given/known data 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?