更新1:
how about if I wanted to find speed of a speck of dust on the outside edge of this disk?
how about if I wanted to find speed of a speck of dust on the outside edge of this disk?
收錄日期: 2021-04-18 18:01:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180109030926AAtfzCC