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The figure below shows an arrangement of 15 identical disks that have been glued together in a rod-like shape of length L = 1.1500 m and (total) mass M = 150.000 g. The arrangement can rotate about a perpendicular axis through its central disk at point O.

(a) What is the rotational inertia of the arrangement about that axis?
Your answer is incorrect. kg · m2

(b) If we approximated the arrangement as being a uniform rod of mass M and length L, what percentage error would we make in using the formula in Table 10-2e to calculate the rotational inertia?


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