http://boud.livejournal.com/ ([identity profile] boud.livejournal.com) wrote in [community profile] engineering_ru 2014-12-18 08:53 pm (UTC)

Может и не держаться - ничего не изменится, так как нет внешних сил.

А вот в случае со стальным шаром есть внешняя сила.
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