问题 选择题

一列沿x轴正方向传播的简谐机械横波,波速为4 m/s.某时刻波形如图所示,下列说法中正确的是(   )

A.这列波的振幅为4 cm

B.这列波的周期为1 s

C.此时x=4 m处质点沿y轴正方向运动

D.此时x=4 m处质点的加速度为0

答案

CD

题目分析: 振幅等于y的最大值,故这列波的振幅为A=2cm.故A错误;由图知,波长λ=8m,由波速公式v=λ/T,得周期T=2s.故B错误;简谐机械横波沿轴正方向传播,由波形平移法得知,此时=4m处质点沿y轴正方向运动.故C正确;此时=4m处质点沿处于平衡位置,加速度为零.故D正确。

填空题
阅读理解

信息匹配。

    阅读下列应用文及相关信息,并按照要求匹配信息。

    请阅读下面出现在英国报刊的有关课程招生的广告信息:

     A. MATHEMATICS, English, Science & more. All ages. Ring Paul 9905-9995

     B. MATHS tutoring in your home. All high school levels or above. Yr7-12, $50-60ph. Contact

          Andrew 041 8-4116-3 83, or email Andrew-bb@yahoo.com.au

     C. MONA VALE Education Centre. All subjects, levels, abilities. Small groups/individual, esp.

          for youngkids. Ph 9918-0011

     D. NEWPORT Education Centre. Professional tutoring in Maths, English, Reading, Spelling. 

          Years 1 to 12.Free assessment. Sharyn Whitton 9979 9421

     E. Accelerated MIND BODY SOUL NATURAL HEALING Private Courses/ Programs

         Heal Yourself / Help Others REIKI 1 2 3 ORION/THETAHEALING *HELEN

         WENHAN 5591-6677*

     F. Acrylic Nail Courses and Waxing Courses (including Brazilian) Day Course Begins FOR

        ACRYLIC NAILS Tuesday 31st Oct. Evening Course 6th November WAXING COURSE

        Starts every-Monday FULLY ACCREDITED Bookings Essential Limited Numbers! 

        Ph.5596~7998

     请阅读下面的学习者信息,然后匹配符合他们要求的学习课程

     1. John, a fourteen-year-old young boy, is poor at math and physics and has to improve them in order

to pass the final exam at school.

     2. Mr. Black Smith, a labor worker on dock who would like to change to some technological job

since he is already 43 and a bit too old for hard labor work. He has to work from Monday to Saturday

but is free after 5:00 in the afternoon.

     3. Chen Hua, a Chinese middle school student who has just moved to the USA. She will have to finish

the course all in English at school there but her English is not good enough.

     4. Tim, a graduated college student who wanted to quit his job and go on his study for M. A. He

planned to take the MBA courses and would ha've to improve his math because he majored in Art at

college.

     5. Mrs. Tumer, a working mother with two young kids. She thinks education is a race and it's better

to prepare kids more and earlier. Her neighbors, several other families share the same opinion and they

are all thinking about sending their young kids to some pre-school education program.