Answer :
The point of application of w and the axis of rotation rn = 0 rw = 0.075m
What is axis of rotation?
Because the axis of rotation is an imagined object, it might be challenging to understand. Axis of rotation, in terms of human anatomy, is a hypothetical line that passes through the joint's pivot or rotation point (for example, the axis of rotation for flexing and extending the arm projects through the elbow joint).
The distance rn between the point of application of n and the axis of rotation is the normal Force acting at the normal Force only, therefore the distance between them rn is zero.
The gravity acts exactly 1/2 of the length of the pencil. Hence the distance between the weight and point of the application is 0.075m.
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