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wyjjf: 金币+40, 翻译EPI+1, ★★★★★最佳答案, 非常感谢，帮了我大忙！ 2016-09-09 20:36:16

Someone drops a box with a crack into the sea. Soon water starts to leak into the box. The box does not sink to the bottom instantly, because the box is filled up with water and there is an air pocket inside the box. When pulling upwards with a force F through a strand of rope tied to the top of the box, the box rises a little. However, the F is not strong enough to lift the box till the crack is above the sea level. Slowly reduces the force F, the box returns to the original place. Suppose the speed is kept constant for the upward and downward movements, answer the following question: what will happen to water during the pulling and sinking processes? will the water empty from the box or fill in through the crack?

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2楼2016-09-09 19:25:38

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