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Angular Acceleration

  • Thread starter apaxapax
  • Start date
  • #1
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Homework Statement



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




Homework Equations





The Attempt at a Solution

 

Attachments

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31

Homework Statement



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?
 
  • #3
14
0
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
 
  • #4
Doc Al
Mentor
44,892
1,144
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?
 
  • #5
14
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I = 1/2mr2
 
  • #6
Doc Al
Mentor
44,892
1,144
  • #7
14
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thanks for the help. much appreciated
 

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