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How fast, in rpm, would a 5.4 kg , 21-cm-diameter bowling ball have to spin to...

How fast, in rpm, would a 5.4 kg , 21-cm-diameter bowling ball have to spin to have an angular momentum of 0.21 kgm2/s ? There was a similar question on chegg and I tried to follow the steps with my variables to no avail. Please help! My mastering physics program said my answer of 166.2 rpms was wrong.

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