I don't really understand how to answer this problem. It says: 'Suppose that you are holding a pencil balanced on its point. If you release the pencil and it begins to fall, what will be the angular acceleration when it has an angle of 10.0 degrees from the vertical?'

I already have the forces that are acting upon the pencil which is the normal force and the weight. But my question is:
What is the distance r_n between the point of application of n and the axis of rotation? What is the distance r_w between the point of application of w and the axis?

'n' being the normal force
'w' being the weight
The distance 'r' is 15 cm long and the weight of the pencil is 10.0 g


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