问题 选择题

2011年9月29日,我国成功发射了“天宫一号”目标飞行器,“天宫一号”进入工作轨道后,其运行周期约为91 min。随后不久发射的“神舟八号”飞船在2011年11月3日凌晨与“天宫一号”在太空实现交会对接。若对接前的某段时间内“神舟八号”和“天官一号”处在同一圆形轨道上顺时针运行,如图所示。下列说法中正确的是                                             (   )

A.“神舟八号”的线速度小于同步卫星的线速度

B.“神舟八号”和“天宫一号”的运行周期相同

C.“神舟八号”和“天宫一号”的向心力大小相同

D.若“神舟八号”仅向运动相反方向喷气加速,它将能在此轨道上和“天宫一号”实现对接

答案

答案:B

多天体围绕同一天体做匀速圆周运动时,万有引力提供向心力,即,解得,可知,轨道半径相同,v、 ω、、T都相同,A错B对;向心力, 而“神舟八号”的质量和“天宫一号”不同,故C错误;“神舟八号” 仅向运动相反方向喷气加速,则其运动的轨道就会改变,无法实现与“天宫一号”的对接,故D错误。

选择题
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Are you feeling anxious about your test next week? Here are some tips that will help you in dealing with stress(压力) and anxiety.

Study regularly

One of the most important ways of avoiding test anxiety is to prepare well in advance. Study regularly for a few hours every day.      小题1:     .

Reduce study pressure(压力)

If students are not able to deal with anxiety or nervousness, they could talk to their teachers, student counselors(辅导员), parents or friends. Parents should also avoid pressurizing(加压) their kids to do well.      小题2:

    Then your children can study without any tension(紧张). Another important point that arises here is neither the students nor the parents should compare the children with their other classmates and friends.

Physical fitness

    小题3:    Many times due to anxiety students avoid sleep and starve themselves. They should sleep for at least 6-7 hours a day and eat nutritious and healthy food. Exercising regularly is equally important as talking to friends and socializing(社交).

    小题4:   

Plan your studies well. Chart(制图) out a timetable and take proper breaks between studying. Along with the study time, allot (分配) time to relax and do what you love to do. Practicing simple breathing skills will also help reduce stress.

    小题5:    While it is important to gain good scores in tests, it is not the most important thing in life. Learning to deal with nervousness and stress will not only help them to do well in school tests, but also in their future life.

A.Prepare schedule

B.Listen carefully in class

C.Do not forget to eat and sleep properly.

D.It helps in increasing the confidence of students.E. Create a peaceful and relaxing atmosphere (放松的气氛) at home.

F. Students should remember that tests are just a part of life.

G. Test and exam time causes a lot of nervousness in students.