题目内容
在下面括号内列举的科学家中，对发现和完善万有引力定律有贡献的是。（安培、牛顿、焦耳、第谷、卡文迪许、麦克斯韦、开普勒、法拉第）
第谷、开普勒、牛顿、卡文迪许解析:
第谷搜集记录天文观测资料、开普勒发现开普勒三定律、牛顿发现万有引力定律、卡文迪许测定万有引力常数
第谷搜集记录天文观测资料、开普勒发现开普勒三定律、牛顿发现万有引力定律、卡文迪许测定万有引力常数
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相关题目
［物理选修3-5模块］[
（1）下列叙述中符合物理学史实的有（ ）
（2）如图所示，光滑水平路面上，有一质量为m1=5kg的无动力小车以匀速率v0=2m/s向前行驶，小车由轻绳与另一质量为m2=25kg的车厢连结，车厢右端有一质量为m3=20kg的物体（可视为质点），物体与车厢的动摩擦因数为μ=0.2，开始物体静止在车厢上，绳子是松驰的．求：
①当小车、车厢、物体以共同速度运动时，物体相对车厢的位移（设物体不会从车厢上滑下）；
②从绳拉紧到小车、车厢、物体具有共同速度所需时间．（取g=10m/s2）
（1）下列叙述中符合物理学史实的有（ ）
| A．托马斯·杨通过对光的干涉现象的研究，证实了光具有波动性 |
| B．卢瑟福通过“α粒子散射实验”的研究，发现了原子核是由质子和中子组成的 |
| C．麦克斯韦验证了电磁场理论，提出了光是一种电磁波 |
| D．贝克勒尔发现了天然放射现象，并提出了原子的核式结构学说 |
①当小车、车厢、物体以共同速度运动时，物体相对车厢的位移（设物体不会从车厢上滑下）；
②从绳拉紧到小车、车厢、物体具有共同速度所需时间．（取g=10m/s2）
Once, a circle lost a piece of its own. The circle wanted to be whole, so it went around looking for its missing piece. But it was incomplete, so it could only roll very slowly. It enjoyed the flowers and the sunshine along the way. It talked with worms. It found lots of different pieces, but none of them fit. So it left them all by the side of the road and kept on looking for the missing piece.
Then one day the circle found a piece that fit perfectly. The circle put the missing piece into itself. It could be whole with nothing missing. It was so happy and began to roll. Now that it was a perfect circle, it could roll very fast, too fast to see flowers or talk to worms. It realized how different the world was when it rolled so quickly. It felt so sad that it stopped, left its found piece by the side of the road and rolled away slowly.
Sometimes we are perfect when we lose something. A man who has everything is a poor man in some ways. He will never have hopes, dreams or something better. He will never know someone loves him or someone is giving him something he has always wanted or never had.
We couldn’t be perfect, but we must be brave enough to love, strong enough to forgive, kind enough to share happiness with others and clever enough to know there is enough love around us and then we can always live a wonderful time in our lives.
【小题1】
The circle rolled very slowly because it .
【小题2】
Why did the circle stop when it rolled quickly? Because it .
【小题3】
The story mainly tells us that .
Then one day the circle found a piece that fit perfectly. The circle put the missing piece into itself. It could be whole with nothing missing. It was so happy and began to roll. Now that it was a perfect circle, it could roll very fast, too fast to see flowers or talk to worms. It realized how different the world was when it rolled so quickly. It felt so sad that it stopped, left its found piece by the side of the road and rolled away slowly.
Sometimes we are perfect when we lose something. A man who has everything is a poor man in some ways. He will never have hopes, dreams or something better. He will never know someone loves him or someone is giving him something he has always wanted or never had.
We couldn’t be perfect, but we must be brave enough to love, strong enough to forgive, kind enough to share happiness with others and clever enough to know there is enough love around us and then we can always live a wonderful time in our lives.
【小题1】
The circle rolled very slowly because it .
| A．spent much time talking to worms | B．wanted to enjoy the sunshine |
| C．was looking for its missing piece | D．lost a piece of its own |
Why did the circle stop when it rolled quickly? Because it .
| A．wanted to enjoy the world | B．found a different world |
| C．wanted to look for another missing piece | D．thought the world changed so quickly |
The story mainly tells us that .
| A．nobody loves us if we give nothing |
| B．a man who has everything is the happiest |
| C．losing something may not be a bad thing sometimes |
| D．we are not whole when we lose something |
-- Please bring little Tom next time you come to Anhui.
--______, thank you.
--______, thank you.
| A．I will | B．I hope so | C．That's right | D．My pleasure |
—Could you tell me_________?
—By underground.
—By underground.
| A．how did you come here |
| B．how you came here |
| C．when did you come here |
| D．when you came here |
The old lady is seriously ill we can’t tell her about the death of his son.
| A．very; that | B．too; to | C．so; that | D．such; that |
最近老师组织全班同学在英语课上开展有关“做家务活”的讨论。假如你是吴军（Wu Jun），以下是你所在小组的讨论表，请你根据这一记录表，用英语向全班同学汇报讨论结果。
| Name | Chores |
| Wu Jun | Clean up rooms |
| Jia Mei | Help Mun cook dinner |
| Wang Ping | Do the laundry |
| Li Lin | Do the dishes |
— David promised to come round to have supper with us today.
— But he ____. I’ve been alone for half an hour.
— But he ____. I’ve been alone for half an hour.
| A．won’t | B．hadn’t | C．hasn’t | D．doesn’t |