问题
选择题
做简谐运动的质点在通过平衡位置时,下列物理量中具有最大值的物理量是( )
A.动能
B.加速度
C.速度
D.位移
答案
AC
质点在通过平衡位置时速度最大,故动能最大.这里讲的位移都是以平衡位置为参考的,故此时位移为零.
做简谐运动的质点在通过平衡位置时,下列物理量中具有最大值的物理量是( )
A.动能
B.加速度
C.速度
D.位移
AC
质点在通过平衡位置时速度最大,故动能最大.这里讲的位移都是以平衡位置为参考的,故此时位移为零.
阅读理解。 | |
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A. every day B. from English Coaching Paper C. on March 19, 1996 D. on February 3, 1996 2. If a British editor has worked in China for three years and comes to English News Paper office to ask for the job on time, he will _______. A. get the job B. not get the job C. be a good editor D. be useless 3. Where and when will the football match be? A. In Guo'an on February 8. B. In Hongkou Stadium on February 3. C. In Hongkou Stadium on Sunday. D. In Shenhua Stadium on February 8. 4. If three adults and six students want to watch the match, the tickets will cost RMB_______ yuan. A. 195 B. 135 C. 225 D. 165 5. Which of the following is WRONG? A. In ten days, the second piece of ad will be useless. B. The telephone number of English News Paper is 3890666. C. The match is between Beijing Team and Guo'an Team. D. Xu Genbao is a coach. |