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## Main Question or Discussion Point

I was watching a physics lecture and the instructor made the statement that "for a

What am I missing?

Thanks!

__given__mass, decreasing the diameter of the body makes it*harder*to spin up". In one way this makes sense, as with a smaller diameter one has a shorter torque arm to work with... however, I seem to recall from my physics that the moment of inertia goes as r^2. Which would say that it would be easier to spin up as the size decreases.What am I missing?

Thanks!