How Does Mass Influence Angular Acceleration?

[apaxapax]

Homework Statement

See attached

Homework Equations

Ok..Im having difficulty with this problem. I don't 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 can't get there..any help would be great

thanks

Homework Equations

The Attempt at a Solution

 

[rock.freak667]

Homework Statement

See attached

Homework Equations

Ok..Im having difficulty with this problem. I don't 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 can't get there..any help would be great

thanks

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

 

[apaxapax]

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]

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?

 

[apaxapax]

I = 1/2mr²

 

[Doc Al]

I = 1/2mr²

Good!

 

[apaxapax]

thanks for the help. much appreciated