# Angular Acceleration

See attached

## Homework Equations

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

## 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

## The Attempt at a Solution

#### Attachments

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rock.freak667
Homework Helper

See attached

## Homework Equations

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

## 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
Well the tension would exert a torque, so what equation relates torque and angular acceleration?

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

Doc Al
Mentor
t=mr2α

that should do it I think..anyone like to confirm?
Almost. The general equation that you need, as rock.freak was leading you towards, is:
Torque = I*alpha

What's I for a uniform disk?

I = 1/2mr2

Doc Al
Mentor
I = 1/2mr2
Good!

thanks for the help. much appreciated