(a) A uniform \( 2.00 \mathrm{~kg} \) disk of radius \( 0.300 \mathrm{~m} \) can rotate around i...

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(a) A uniform \( 2.00 \mathrm{~kg} \) disk of radius \( 0.300 \mathrm{~m} \) can rotate around its central axis like a merry-go-round. Beginning from rest at time \( t=0 \), it undergoes a constant angular acceleration of \( 30.0 \mathrm{rad} / \mathrm{s}^{2} \). When is the rotational kinetic energy equal to \( 2000 \mathrm{~J} \) ? (b) Repeat the calculation but substitute a ring of the same mass and radius and assume that the spokes have negligible mass.
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