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A yo-yo has a mass of 0.774 kg, a moment of inertia of 0.01 kgm2, and a string that is 0.764 m in length. If it climbs the string so that it just barely makes it to the top, what was its angular velocity (rad/s) just before it started up?
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Added Sun, 26 Jul '15
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0.5*I?^2=r*F

?2=0.764*0.774*9.8*Sin900/0.01

? =34.04rad/sec

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Added Sun, 26 Jul '15
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