题干

在学习了液体压强知识后,某小组同学对如图所示实验产生了兴趣,他们想继续探究实验中使薄片恰好下落时管内水的深度H与什么有关.他们在液体槽中装入甲液体,在两端开口、粗细均匀的玻璃管的下端贴一个比管口稍大的塑料薄片,并将玻璃管竖直插入液体槽中,然后顺着管壁从上端开口处向管内缓缓注水,直至观察到薄片恰好脱离管口下落.记录玻璃管的管口面积S、槽中液体密度ρ和玻璃管插入液体的深度h,管中水的深度H.接着改变深度h、槽中液体的种类和玻璃管的粗细,重复实验,所有数据均记录在下表.(薄片的重力、玻璃管的厚度忽略不计)

实验序号

槽中液体密度(×103千克/米3

深度

  h(米)

管口面积

S(×1042

水的深度

  H(米)

1

0.8

0.1

5

0.08

2

0.2

5

0.16

3

0.3

5

0.24

4

0.3

10

0.24

5

1.0

0.06

5

0.06

6

0.1

5

0.10

7

0.16

5

0.16

8

0.2

5

0.20

9

1.2

0.05

3

0.06

10

0.1

3

0.12

11

0.2

3

0.24

12

0.2

8

0.24

①分析比较实验序号____的数据及相关条件初步得出:玻璃管竖直插入同种液体中,使薄片恰好下落时管内水的深度与管口面积S无关.

②分析比较实验序号1、2与3(或5、6、7与8或9、10与11)的数据及相关条件可初步得出:玻璃管竖直插入同种液体中,____

③分析比较实验序号1、6与10(或2、8与11)的数据及相关条件可初步得出:当玻璃管竖直插入不同种液体中,____

④进一步综合分析表中数据,可初步得出:玻璃管竖直插入液体中,当____时,薄片恰好下落时管内水的深度相同.

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同类题1

 Are you a happy person most of the time? Or do you easily get angry sometimes? Everyone has a different temperament (脾气). It is usually believed that both genes (基因) and environment may affect people's temperaments in different ways. But now scientists have found that the season of birth also plays a role.

 Scientists from Budapest, Hungary, studied 400 university students. In the study, the students needed to finish a questionnaire (问卷). The purpose of it was to find out which of four kinds of temperaments they most had. From the questionnaire, scientists found that the students always answered something like "My mood often changes for no reason" and "I love to deal with new projects, even if it is risky". These answers were then matched with their birthdays.

  They discovered that people born in summer easily change between sad and happy moods compared to people born in winter. Those who always feel positive are mostly born in spring and summer.

The study also found that those born in autumn less probably had a mood of depression which may easily drive them to cry, while those born in winter were not easier to be angry.

 Scientists said that this was probably because the seasons had an influence on certain chemicals in the human body. And the chemicals are important to control people's moods even in adult life.

  ____________________________________________________________________________

"It seems that when you are born may increase or decrease your chance of developing certain mood disorders (紊乱)," lead scientist Xenia Gonda told The Telegraph.