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Given the mass of the yo-yo is m and the length of the string (radius of the circle traced by the yo-yo) is L, you find the moment of inertia to be I. If you double the length of the string, what is the new moment of inertia

Sagot :

At condition 1:
I = mL^2
At condition 2:
I’ = m(2L)^2 = 4mL^2 = 4I