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Rolling spherical shell: ratio of rotational to total kinetic energy

The same question, asked 2 times: 12 Apr 2023, 5 Apr 2024. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    12 Apr 2023

    22
    For a rolling spherical shell, the ratio of rotational kinetic energy and total kinetic energy is x5\frac{x}{5}. The value of xx is___
  2. Question 2

    5 Apr 2024

    115
    A hollow sphere is rolling on a plane surface about its axis of symmetry. The ratio of rotational kinetic energy to its total kinetic energy is x5\frac{x}{5}. The value of xx is _______ .