 #1
KittyCat1534
 8
 0
 Homework Statement:

So I have a question which goes like this:
A 3.0 kg block rests on a 30° slope and is attached by a string of negligible mass to a solid drum of mass 0.85 kg and radius 5.0 cm, as shown in Fig. 10.29. When released, the block accelerates down the slope at 1.4 m/s2. What is the coefficient of friction between block and slope?
I've attached the diagram below. I've managed to find the answer, but I don't understand why the tension coming from the torque is T = IA/R^2, instead of just T = IA.
Thanks for the help!
 Relevant Equations:
 T = IA / R^2