Make up your own problem using rock attached to wheel
https://app.pivotinteractives.com/activities/59551fc89203d00011b62f08/preview
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Category: Conservation of angular momentum
Check conservation of L and energy
https://app.pivotinteractives.com/activities/5a0df637be76c1001ed0d788/preview
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Use conservation of L to find MoI of disc
https://app.pivotinteractives.com/activities/5a0e67efbe76c1001ed0d79c/preview
N.B. Preview is created automatically, doesn't always work and may capture splash screens.