Angular Acceleration

1. The problem statement, all variables and given/known data

See attached

2. Relevant equations

Ok..Im having difficulty with this problem. I dont see what m has to do with angular accerleration.

3. The attempt at a solution
I believe the equation to use for this is a=rα ? I just cant get there..any help would be great

thanks




2. Relevant equations



3. The attempt at a solution

 

ok..found an equation....guess I need to organize equations better..seems to be my big problems.
t=mr²α

that should do it I think..anyone like to confirm?

thanks

 

I = 1/2mr²

 

thanks for the help. much appreciated