CSSA 2020 Physics Q35d (1 Viewer)

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carrotsss

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I did the exact same working as them except I used 1.5*10^-3 rather than 2.5*10^-3 for and got
1692422419893.png
1692422437038.png

It's a bit weird because they literally imply in the previous solution that r is 1.5*10^-3
1692422518208.png

Why do they say that r is 2.5cm rather than 1.5cm in (d)?
 
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chilli 412

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surely its 1.5cm because the armature isnt rotating along the other axis (the long one)
 
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