您所在的当前位置：初中物理试题 >

物质的物理特征

> 现有一扇形的均质金属物体，该材料具有热胀冷缩的性质，如图所示．室温状态下AB、CD边所成的圆心角为α．若使物体温度均匀升高，则α角的变化情况是 A.变大 B.不变 C.变小 D.无法确定

问题：

发布时间：2024-09-08

现有一扇形的均质金属物体，该材料具有热胀冷缩的性质，如图所示．室温状态下AB、CD边所成的圆心角为α．若使物体温度均匀升高，则α角的变化情况是

A.变大
B.不变
C.变小
D.无法确定

参考答案：

提问用户：H7***KwB

可能感兴趣的题目：

1 It was only after he had read the papers ________ Mr.Gross realized the task before him was extremely difficult to complete. (2013·大纲全国，30) A．when B．that C．which D．what
2 在强酸性无色透明溶液中，下列各组离子能大量共存的是（　　） A．Fe3+、K+、Cl-、MnO4- B．Ag+、Na+、NO3-、I- C．Zn2+、Al3+、SO42-、Cl- D．Ba2+、NH4+、Cl-、HCO3-
3 阅读理解。 A jobless man applied for the position of "office boy" at Microsoft. The HR manager interviewed him and then watched him cleaning the floor as a test. "You are employed," he said. "Give me your e-mail address and I"ll send you the application to fill in, as well as date when you may start." The man replied, "But I don"t have a computer, neither an e-mail." "I"m sorry," said the HR manager. "If you don"t have an e-mail, that means you do not exist. And whoever doesn"t exist cannot have the job." The man left with no hope at all. He didn"t know what to do, with only ten dollars in his pocket. He then decided to go to the supermarket and buy 10kg tomatoes. He then sold the tomatoes from door to door. In less than two hours, he succeeded to double his capital. He repeated the operation three times, and returned home happily with 60 dollars. The man realized that he can survive in this way, and started to go every day earlier, and return late. Thus, his money doubled or tripled every day. Shortly, he bought a cart, then a truck, and then he had his own fleet of delivery vehicles. Five years later, the man is one of the biggest food retailers in the US. He started to plan his family"s future and decided to have a life insurance. He called an insurance broker and chose a protection plan. When the conversation was concluded the broker asked him his e-mail. The man replied, "I don"t have an e-mail." The broker answered curiously, "You don"t have an e-mail, and yet have succeeded to build an empire. Can you imagine what you could have been if you had an e-mail?" The man thought for a while and replied, "Yes, I"d be an office boy at Microsoft!" 1.Why can"t the man have the job at Microsoft? A. Because he was lazy. B. Because he didn"t pass the test. C. Because he didn"t have an e-mail. D. Because he didn"t have a computer. 2.The underlined word "triple" can be replaced by ______. A. become large B. become 3 times C. increase quickly D. decrease quickly 3. According to the passage, which of the following is TRUE? A. The man is one of the biggest food retailers in the world. B. The man didn"t give up though he failed the interview. C. He started his career by selling tomatoes in the supermarket. D. Those who have e-mails can work at Microsoft. 4. The man can be described as _______. A. helpful and considerate B. positive and generous C. smart and hardworking D. stubborn and unselfish 5. Which proverb can best describe the story? A. Misfortune may be an actual blessing. B. Where there is a will, there is a way. C. Accidents will happen. D. No pains , no gains.
4 下列程序的输出结果是（　　） A．2，2 B．3，2 C．2，3 D．3，3
5 （8分）以下是实验室制取氯气的装置，在图中饱和食盐水的作用是_____________，浓硫酸的作用是____________________，F中盛放的溶液是__________________________，起的作用是_____________________________。
6 人们常说“水滴石穿”，请你根据下面提供的信息，估算出水对石头的冲击力的大小．一瀑布落差为 h=20m，水流量为 Q=0．10m 3/s，水的密度 kg/m 3，水在最高点和落至石头上后的速度都认为是零．（落在石头上的水立即流走，在讨论石头对水的作用时可以不考虑水的重力，g取10m/s 2）（13分）
7 ________ go to see our teacher at once? A.What about B.Shall you C.Do we D.Why not
8 如图，△ABC中，AB=4，AC=4，∠BAC=60°，延长CB到D，使，当E点在线段AD上移动时，若的最大值是（） A．1 B． C．3 D．
9 (10分)如图所示，在成都天府大道某处安装了一台500万像素的固定雷达测速仪，可以准确抓拍超速车辆以及测量运动车辆的加速度。一辆汽车正从A点迎面驶向测速仪B，若测速仪与汽车相距355m，此时测速仪发出超声波，同时车由于紧急情况而急刹车，汽车运动到C处与超声波相遇，当测速仪接受到发射回来的超声波信号时，汽车恰好停止于D点，且此时汽车与测速仪相距335m，忽略测速仪安装高度的影响，可简化为如图所示分析（已知超声波速度为340m/s，）。（1）求汽车刹车过程中的加速度a；（2）此路段有80km/h的限速标志，分析该汽车刹车前的行驶速度是否超速?
10 Can you tell me________it was________your cellphone was lost? A．where；that B．which；that C．that；where D．where；which