问题 实验题

在“用单摆测重力加速度”的实验中,按实验要求,步骤得到五组实验数据如下:

摆长L(m)0.600.700.800.901.00
周期平方T2(S22.412.823.223.624.02
(1)根据上述数据,在L、T2的坐标图上画出T2与L的关系图线;

(2)利用T2与L的关系图线,计算重力加速度的表达式是:g=          

(3)测得的g值是:            。(结果保留三位有效数字)

答案

(1)如图所示

(2)

(3)9.86m/s2

阅读理解

Most people work or study from Monday to Friday. The weekend is usually a time of rest. But today's Chinese teenagers can hardly rest during the weekends.

According to a survey, 24% of the Grade 8 students in Beijing have classes at the weekend. Over 40% of the middle school students have less than eight hours’ sleep each night because of study.

And this isn't only in Beijing. Ji Chunying is a Grade 9 student in Guangzhou. The 14-year-old girl has to get up at 6:45 am on Saturday. Then she has a whole day of classes. On Sunday, she goes to extra classes for math and physics.

But Ji doesn't complain. She says her classmates all work very hard.

Finding time to have fun

Zhao Yang, 13, is from Dalian, Liaoning. As a Grade 8 student, Zhao's weekend is less busy. But he still spends Saturday in school. On Sunday, after finishing homework, he plays basketball. "I feel happy because I still have time to do the things I like," he said.

Some students are much luckier. They don't have to go to school on the weekend.

Ding Yi, a Grade 8 student from Laiwu, Shandong, is one of them. And she's a top student.

During the weekend, Ding usually gets up at 8 am. Then she spends some time doing homework. After that she is free to go shopping or watch TV.

Ding said her mother once wanted her to try extra classes. But when they asked Ding's teacher about it, the teacher said it was unnecessary.

"My teacher said I don't need to push myself too much. Learning well at school is enough," Ding said. "I feel pretty lucky."

小题1:Over 40% of the middle school students have less than eight hours sleep each night because of ___________.

A.playing computer games

B.playing with friends

C.busy study

D.watching TV小题2:How many students are mentioned in this passage?

A.2.

B.3.

C.4.

D.5.小题3:We can learn from the passage that ___________.

A.Some middle school students can enjoy their weekend.

B.All the students in China are busy studying on the weekend.

C.Every student in China has to go to extra classes on the weekend.

D.All the students complain about their busy weekend.小题4:The above text may be a _______.

A.a story of science

B.school notice

C.short play

D.news report

选择题