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某物理实验小组在成都七中游泳池做了一个实验：将一个小木球离水面5m高静止释放（不计空气阻力），经1.40s后落入池底速度刚好为零。假定木球在水中做匀减速运动，重力加速度g=10m/s².求：

（1）木球在水中运动的加速度的大小

（2）游泳池水的深度

答案

参考答案：

（1）

（2）

单项选择题

A narrowing of your work interests is implied in almost any transition from a study environment to managerial or professional work. In the humanities and social sciences you will at best reuse only a fraction of the material (1) in three or four years’ study. In most career paths academic knowledge only (2) a background to much more applied decision-making. Even with a " training " form of degree, (3) a few of the procedures or methods (4) in your studies are likely to be continuously relevant in your work. Partly this (5) the greater specialization of most work tasks compared (6) studying. Many graduates are not (7) with the variety involved in (8) from degree study in at least four or five subjects a year to very standardized job (9) . Academic work values (10) inventiveness, originality, and the cultivation of self-realization and self-development. Emphasis is placed (11) generating new ideas and knowledge, assembling (12) information to make a " rational " decision, appreciating basic (13) and theories, and getting involved in fundamental controversies and debates. The humanistic values of higher (14) encourages the feeling of being (15) in a process with a self-developmental rhythm. (16) , even if your employers pursue enlightened personnel development (17) and invest heavily in " human capital " —for example, by rotating graduate trainees to (18) their work experiences—you are still likely to notice and feel (19) about some major restrictions of your (20) and activities compared with a study environment.

4（）

A.practiced

B.described

C.encountered

D.analyzed
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单项选择题

新课程强调教师向学生学习，倾听学生的看法和观点，这主要要求师生之间建立的关系是( )。

A．民主平等

B．尊师爱生

C．心理相容

D．教学相长
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