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Originally Posted by threewingedfury
^ but they are made of different materials, so the density would be different in them - does the density not matter?
So I'm getting the idea of either half or twice the translational energy - any ideas?
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If rotational kinetic energy is .5 I w^2 (it seems like it should be)
translational velocity is v
translational kinetic energy is .5 m v^2 (v = wr)
w = angular velocity = v/r (r = radius)
rotational k.e. is then 0.5 mr^2 * (v/r)^2 = the key to your answer (provided i didn't mess things up)