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## Homework Statement

This is not really a question on how to solve the problem, I'm just trying to get clarification on something. For angular acceleration, α, can someone explain to me what α

_{z}is? And why does α

_{z}= α / R = α

_{y}? I understand the rest of the problem, I just don't understand where or what α

_{z}is and how α

_{z}= α / R = α

_{y}. Thanks in advance for any help given!