3.一物体质量为2kg,以4m/s的速度在光滑水平面上向左滑行,从某时刻起作用一向右的水平力,经过一段时间后,滑块的速度方向变为水平向右,大小为4m/s,在这段时间内水平力做功为( )
A.0 B.8J C.16J D.32J
2. 若人造卫星绕地球作匀速圆周运动,则下列说法正确的是( )
A. 卫星的轨道半径越大,它的运行速度越大
B. 卫星的轨道半径越大,它的角速度越大
C. 卫星的质量一定时,轨道半径越大,它需要的向心力越大
D. 卫星的质量一定时,轨道半径越大,它需要的向心力越小
1.下列几种情况下力F都对物体做了功
①水平推力F推着质量为m的物体在光滑水平面上前进了s
②水平推力F推着质量为2m的物体在粗糙水平面上前进了s
③沿倾角为θ的光滑斜面的推力F将质量为m的物体向上推了s。
下列说法中正确的是( ).
A.③做功最多 B.②做功最多 C.做功都相等 D.不能确定
第二节 书面表达(满分30分)
假如你计
划高考结束后去上海参观世博会,为了在增长见识的同时提高英语口语,欲寻一位英美朋友同行,可同时担任对方导游。请根据以下内容发个英文帖子。
时间 |
6月28日到7月4日 |
要求 |
无不良嗜好,对世界文化感兴趣 |
活动 |
参观世博园,参加世博会的各种活动 |
费用 |
自理 |
联系方式 |
wxjer2010@ Tel:0411 – 84759134 |
注意:
1.词数100左右;
2.可适当增加细节以使行文连贯;
3.开头已为你写好,不计入总词数。
4.提示:上海世博会 Shanghai Expo 联系 contact 展馆 pavilion
I am a high school student, easy – going and trustworthy
第一节 短文改错(共10小题;每小题1分,满分10分)
Walter’s goal in life was become a successfully doctor. He knew he had to finish high school first, so he put his heart into his study – in particular, biology, chemistry, and maths. Because he worked hard at these subjects, Walter became good at it. However, Walter forgot that he needed to master some other subjects beside those he had been chosen. As a result, Walter fails both English and Latin in the end of the second school year. But he had to repeat these subjects and he was almost unable to graduate like pawned. Walter learned a good lesson.
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