试题与答案

如图所示,在半径R=mv0Bq的圆形区域内有水平向里的匀强磁场,磁感应强度的大小

题型:问答题

题目:

如图所示,在半径R=

mv0
Bq
的圆形区域内有水平向里的匀强磁场,磁感应强度的大小为B,圆形区域右侧有一竖直感光板,一带正电粒子从圆弧顶点P以速率v0平行于纸面进入磁场,已知粒子的质量为m、电荷量为q,粒子重力不计.

(1)若粒子对准圆心射入,则它在磁场中运动的时间为多少?

(2)若粒子对准圆心射入,且速率变为

3
v0,则它打到感光板上时平行于感光板方向的速度分量为多少?

(3)若粒子以速度v0从P点以任意角度入射,试证明它离开磁场后均垂直打在感光板上.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0612/88d3dd34c74a331755ff91568ffda00f.html

下面是错误答案,用来干扰机器的。

8;8;7;9;9;9;7;0;7;8;6;9;9;8;4

试题推荐
题型:材料分析题

【国家和国际组织常识】2011年4月8日深夜,美国民主、共和两党已与白宫就2011年美国联邦政府年度财政预算案的一项临时拨款法案达成一致,各方同意就这一临时性的拨款法案达成协议,以维持联邦政府的正常运转。8日夜间,奥巴马、美国众议院议长(共和党领袖)约翰博纳、参议院议长(民主党人)里德等人经过数小时闭门磋商之后,最终达成了这项临时性的财政拨款协议,使政府关门危机暂缓。

结合材料,谈谈你对“国内政治制约奥巴马政府”的认识。

____________________________________________________________________________________________________________________

查看答案
题型: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。请把答案填写在答题卡相对应的题号上。(选E 项,在答题卡上将A,B 涂黑;选F 项,在答题卡上将C,D 涂黑)

         下面是一篇应用文及其应用场合的信息,请阅读下列应用文和相关信息,并按照要求匹配信息。

        首先请阅读下列应用文:

        A

        Sales Manager Requirements:

        Minimum (最少) of 2-year sales experience;

        University /  College degree;

        Good command of English;

        Excellent communication skills;

        Responsible, patient, energetic (精力充沛的),  enthusiastic(热情的);

        Customer service,  teaching experience is preferred;

        Basic office computer skills (Excel, Word, E-mail).

        B

        Project Management Assistant Requirements:

        Good English and computer skills;

        Related working experience is a must;Patient, careful, supportive (给予帮助的);

        Strong team spirit.CEnglish Teacher Requirements:University degree or above in English major;

        Eager to learn and open-minded with creativity (创造力);

        With deep understanding and respect for different cultures.

        D

        Marketing Assistant Requirements:

        College degree or above with good English (speaking and writing) skills;

        With basic ideas of sales and marketing;

        Working experience is not necessary ;       

        Good communication and presentation skills.

        E

        Accountant Requirements:

        College degree or above in finance (金融学) area;

        Good English and computer skills;Good sense of finance management;

        At least two years of experience as an accountant in aninternational organisation is a must;

        Self-management, hard-working, independent and able todeal with pressure.

        F

        Nurse Requirements:

        College degree or above in medicine area;

        Good communication and nursing skills;

        Good sense of responsibility;

        At least two years of experience as a nurse in a bighospital;

        Patient, careful, polite, hard-working.

        请阅读以下职位申请者的信息,然后匹配申请者和所提供的工作岗位。

        1. Harry Evans graduated from the University of Oxford. At the university, he majored in English

Literature, and got a Bachelor's degree (学士学位).   

        2. Jack Blunkett has been an accountant in an international company for four years after graduating

from the Finance University, and he is good at English and computer.

        3. Peter Hessler is a manager of an international company, and his duty is to sell the products of the

company.

        4. Thomas Wright got a master's degree. His spoken English is excellent, but he has no working

experience. He is good at writing and communication.

        5. Alice Elizebeth has worked in a Building Material Company for ten years, and she is expert in

management. She can communicate in English very well.       

          申请者                                       申请职位

1. Harry Evans (     )                   A. Sales Manager

2. Jack Blunkett (     )                 B. Project Management Assistant

3. Peter Hessler (     )                 C. English Teacher

4. Thomas Wright (     )              D. Marketing Assistant

5. Alice Elizebeth  (     )              E. Accountant                               

                                                       F. Nurse

查看答案
微信公众账号搜索答案