Calculating Angular Acceleration of a Rolling Cylinder on an Incline

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To calculate the angular acceleration of a rolling cylinder on an incline, the relevant equations include the linear acceleration a = g * sin(y) and the relationship between angular acceleration α and linear acceleration, given by α = a / r. The moment of inertia I for the cylinder and its mass m are also important factors in the overall dynamics. The user seeks confirmation on the correctness of their calculations and understanding of these principles. Clarification on these equations and their application in this context is needed.
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A cylinder rolling down an incline.Moment of Interia is I
And the cylinders mass is m
Velocity is: v
And cylinder radius: r

Angel on the incline: yhttp://img122.imageshack.us/img122/8756/cylpz9.jpg

How do i calculate the cylinders angular acceleration?
 
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ma=mg*\\siny

a=g*\\siny

angular acceleration:\alpha=a/r

Im i right?
 
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Anyone? :confused:
 
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