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If a disk and a ring both have the same mass and radius, which one has...

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Physics

  1. If a disk and a ring both have the same mass and radius, whichone has the greater moment of inertia? Why is this so?
  2. A figure skater doing pirouettes spins faster when she tucksher arms close to her chest and spins slower when she spreads outher arms. Explain this in terms of moment of inertia and Newton’sSecond Law for rotational motion.

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