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| + | ====== 12. Autumn coin ====== | ||
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| + | The motion of a coin falling to the bottom of a tank filled with liquid can be remarkably similar to the fluttering and tumbling of a falling autumn leaf. Investigate how the motion of the coin depends on relevant parameters. | ||
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| + | ====== 12. 秋叶硬币 ====== | ||
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| + | 硬币在充满液体的容器中沉降至底部的运动，可能与秋叶飘落的飘荡和翻滚极为相似。研究硬币运动如何依赖于相关参数。 | ||