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Sphere Packing

Problem 222

Published on 19 December 2008 at 01:00 pm [Server Time]

What is the length of the shortest pipe, of internal radius 50mm, that can fully contain 21 balls of radii 30mm, 31mm, ..., 50mm?

Give your answer in micrometres (10-6 m) rounded to the nearest integer.


Answer:
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