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【多选题】
( 多选 ) 单摆是为研究振动而抽象出的理想化模型,其理想化条件是 ( ) A .摆线质量不计 B .摆线不可伸缩 C .摆球的直径比摆线长度小得多 D .只要是单摆的运动就一定是简谐运动
A.
1
B.
2
C.
3
D.
4
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【单选题】Z2-01-08质量为20 g的子弹,以400 m/s的速度沿图示方向射入一原来静止的质量为980 g的摆球中,摆线长度不可伸缩。子弹射入后与摆球一起运动的速度为
A.
4 m/s
B.
8 m/s
C.
2 m/s
D.
7 m/s．
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
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【单选题】Z2-01-08质量为20 g的子弹,以400 m/s的速度沿图示方向射入一原来静止的质量为980 g的摆球中,摆线长度不可伸缩。子弹射入后与摆球一起运动的速度为
A.
4 m/s
B.
8 m/s
C.
2 m/s
D.
7 m/s．
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
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