Calculate Torque: Solve the Equation!

[TBBTs]

Homework Statement

http://i.imgur.com/WrwsT.png

Homework Equations

Torque = FR

The Attempt at a Solution

1) I thought I need two torques because they are in oppsite direction

2) I tried use alpha find acceleration and find angular velocity and K=1/2 I omega^2

 

[Redbelly98]

Homework Equations

Torque = FR

What is R in that equation? (Please don't just say "the distance" ... what distance does the R signify?)

The Attempt at a Solution

1) I thought I need two torques because they are in oppsite direction

No, there is only one torque acting on the spool here. There is no friction, and the normal force does not exert a torque.

2) I tried use alpha find acceleration and find angular velocity and K=1/2 I omega^2

You don't need the angular velocity. What is the angular counterpart to Newton's 2nd Law, F=ma?