问题 实验题

“验证机械能守恒定律”的实验可以采用如下图所示的(甲)或(乙)方案来进行。

⑴比较这两种方案,___________(填“甲”或“乙”)方案好些,理由是_______________________________。

⑵如图(丙)是该实验中得到的一条纸带,测得每两个计数点间的距离如图所示,已知每两个计数点之间的时间间隔T=0.1s。物体运动的加速度a=___________m/s2(保留两位有效数字);该纸带是采用__________(填“甲”或“乙”)实验方案得到的。

⑶图(丁)是采用(甲)方案时得到的一条纸带,在计算图中N点速度时,几位同学分别用下列不同的方法进行,其中正确的是:(    )

A.

B.

C.

D.

答案

(1)甲  甲方案中摩擦力较小 (2)4.8 m/s2 乙  (3)BC

题目分析:(1)两种方式比较,甲图纸带所受摩擦力对实验影响较小,所以选择甲图。(2)据逐差法可以求得加速度为:,由于加速度只有重力加速度的一般,所以是采用了乙图。(3)据中间时刻的瞬时速度等于这段时间内的平均速度,所以只有BC选项正确。

阅读理解

Hi, everybody !

Welcome to our newly-opened Richards Cinema Bookstore!

Now let me introduce to you some of the new film books in our store.

Are you Chinese film fans? OK, here comes the latest 25 New Takes about Chinese films. It is a collection of 25 fresh readings of different Chinese films from the 1930s to the present. In recent years, Chinese films are very popular in the States, such as Crouching Tiger and Hidden Dragon, Hero, and Flowers of Shanghai.

Do you like French films? Well, here is The French Cinema Book. It covers French films from the 1890s to the beginning of the 21st century. It is written for all lovers of French cinema: students and teachers, specialists and fans, and so on.

Maybe you are Indian film fans and star-chasers. Then here is Encyclopedia ( 百科全书 ) of Indian Cinema. The book is a complete introduction to all the best Indian films. It also offers a full list of names of the famous and successful film stars in the past ten years. You know, the Indian film industry is the largest in the world after our Hollywood.

If you like British films, we have The British Cinema Book. It is a good review of British cinema. This book contains a good many nice pictures.

In our bookstore, you can also find books about Mexican, Japanese, Australian, German and Italian films..

Well, please help yourselves to some coffee or tea, and have a good time here!

60. The speaker of the passage is most probably _______.

A. the author of 25 New Takes

B. a tourist in the cinema bookstore

C. the manager of the cinema bookstore

D. a reader of Encyclopedia of Indian Cinema

61. How many Asian countries does the speaker refer to when he talks about the film books?

A. Two.             B. Three.            C. Four.              D. Nine.

62. Which of the following statements is NOT mentioned in the passage?

A. Indian cinema is second only to Hollywood.

B. The British Cinema Book includes a complete list of names of stars.

C. Crouching Tiger and Hidden Dragon is well received in the States.

D. The French Cinema Book covers over a century's French films.

63. The purpose of the speaker is_______.

A. to satisfy the customers' various tastes

B. to keep the authors in the cinema bookstore

C. to offer the tourists chances to meet the film stars

D. to mm the readers into film producers

名词解释