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【简答题】
任务型阅读。 Here is a survey about people's preference (偏爱) to shop. Some people were asked where they preferred to shop. Eric is a doctor. He lives in a nice neighborhood with many small shops and restaurants. He likes the friendly shop owners. He doesn't have a car, so shopping near his home is very convenient (便利的). However, he says there are two main problems. First, things from the small shops cost more money. Second, he can't find the books he wants to read in the small bookstore. He has to go to the big bookstores downtown. Cathy is a mother of three children. She and her husband both work as teachers. They like to shop in big supermarkets because they're clean and safe and prices are good there. Supermarkets have many more kinds and sizes of products than small shops. Cathy says supermarkets also have disadvantages. For example, they're always crowded during holidays, and they're so big that children can easily get lost in them. Tony is a student who prefers to shop on the Internet. He thinks the main advantage is that he can shop anytime he likes, even late at night. And he can buy fascinating things from all over the world. The biggest worry is security (安全保障) for the Internet shop. Last year, his credit card number was stolen (窃取). Also, once he paid for some things and never received them. 根据短文内容,将下面表格中的信息补充完整。 Eric Cathy Tony Where to shop In the small shops in his neighborhood. In big supermarkets. __ 4 __. Advantages The shop owners are __ 1 __ and shopping near his home is very convenient. They're clean and safe and prices are good. He can shop anytime he likes, and buy things from __ 5 __. Disadvantages Things from the small shops _ 2 and the small bookstore doesn't have the books he likes. They're always __ 3 __ during holidays and children can get lost in them. Credit card numbers may be stolen. Sometimes people couldn' t get the things they've ordered.
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【判断题】秩相等的向量组等价。
A.
正确
B.
错误
【单选题】在光滑水平面上有一质量为 2 kg 的物体,受几个共点力作用做匀速直线运动.现突然将与速度方向相反的 2 N 的力水平旋转 90° ,则关于物体运动情况的叙述正确的是 ( )
A.
.物体做速度大小不变的曲线运动
B.
.物体做加速度为1.414 m/s 2 的匀变速曲线运动
C.
.物体做速度越来越小的曲线运动
D.
.物体做非匀变速曲线运动,其速度越来越大
【判断题】秩相等的两个向量组等价.
A.
正确
B.
错误
【单选题】在光滑的水平面上做匀加速直线运动的物体,当它所受的合力逐渐减小而方向不变时,则物体的( )
A.
加速度越来越大,速度越来越大
B.
加速度越来越小,速度越来越小
C.
加速度越来越大,速度越来越小
D.
加速度越来越小,速度越来越大
【单选题】用与水平面成α角斜向上的拉力拉着质量为m的物体在水平面上运动,第一次在光滑水平面上,做匀加速直线运动,位移为x,做功w1;第二次在粗糙水平面上,做匀速直线运动,位移为x,作功w2,则( )
A.
w1 > w2
B.
w1 < w2
C.
w1 = w2
D.
无法确定
【多选题】在光滑水平面上有一质量为 2 kg的物体,受几个共点力作用做匀速直线运动.现突然将与速度反方向的2 N的力水平旋转90 ° ,则关于物体运动情况的叙述正确的是
A.
物体做速度大小不变的曲线运动
B.
物体做加速度为 m/s 2 的匀变速曲线运动
C.
物体做速度越来越大的曲线运动
D.
物体做非匀变速曲线运动 ,其速度越来越大
【单选题】如果物体在光滑水平面上做匀速直线运动,并且在水平方向上只受两个力的作用,下列说法中错误的是( )
A.
这两个力一定是一对平衡力
B.
若撤去其中一个力,物体 最后可能会 静止下来
C.
若同时撤去这两个力,物体的运动状态保持不变
D.
若在水平方向上再加一个力,物体的运动状态一定会改变
【判断题】等价的两个向量组的秩相等
A.
正确
B.
错误
【单选题】一物体在光滑的水平面上做匀速直线运动,并且在水平方向上只受两个力的作用。下列说法中,错误的是( )
A.
这两个力一定是平衡力。
B.
如果同时撤掉这两个力,物体将静止下来。
C.
如果同时撤掉这两个力,物体仍将做匀速直线运动。
D.
如果在水平方向上再加一个力,物体的运动状态将改变。
【单选题】一个物体在光滑水平面上做匀速直线运动,从某一时刻起该物体受到一个始终跟速度方向垂直、大小不变的水平力作用,此后物体的运动( )
A.
速度的大小和方向均变化
B.
加速度的大小和方向均变化
C.
轨迹为抛物线
D.
轨迹为圆
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