The poem about the reference system is 1. In the following descriptions of sports, the reference frame is selected in line with the description () A. The poem "Flying"
C
The reference system is selected as the standard object to study the motion of objects. The poem thousands of feet is based on the earth. "When watching the tide in Qiantang, the audience only felt the tide coming" is the frame of reference. "The apes on both sides of the strait can't stop crying, and the canoe has passed Chung Shan Man" is the frame of reference. When the national flag is raised, the national flag of Ran Ran is observed to be raised, and the observer is based on.
Solution: A. The poem "Flying Down Three thousands of feet" shows that the flying stream is moving at a high speed relative to the earth, and it is based on the earth. So, A is wrong.
B. "When watching the tide in Qiantang, the audience only feels that the tide is coming", describing the movement of the tide relative to the audience, taking the audience as the reference system. So, B is wrong.
C, "The apes on both sides of the strait can't stop crying, and the canoe has passed Chung Shan Man" describes the movement of the canoe relative to "Chung Shan Man" and takes "Chung Shan Man" as the frame of reference. So, C is correct.
D. When the national flag is raised, the observer sees the national flag Ran Ran rising, and the observer takes the earth as the reference system. So, d is wrong.
So choose C.
2. Regarding the frame of reference, the following statement is correct.
Answer b
Analysis of test questions: All objects are moving, so we must choose a frame of reference to study the movement of objects. The frame of reference refers to the reference objects selected when studying the motion of objects or the object systems that do not move relative to each other; The choice of reference system is arbitrary. How to choose the frame of reference must be considered from the specific situation. Generally speaking, we use the ground or objects on the ground as the frame of reference. A. The choice of reference system is arbitrary, so moving objects can also be used as reference systems. For example, taking a moving car as a frame of reference to study the movement of people in the car, A is wrong B. Everything is moving. To study the motion of an object, you must choose a reference frame. B. Wrong C. Choosing different objects as the frame of reference may lead to different conclusions. For example, when you study the movement of passengers in a moving car with trees on the roadside as the frame of reference, the two conclusions are different from those of the driver as the frame of reference. C error D. The choice of reference system is arbitrary, which can be an object that is stationary relative to the ground or an object that is moving relative to the ground. How to choose the frame of reference must be considered from the specific situation. Generally, we take the ground or objects on the ground as the frame of reference. D error, test site: this question examines the understanding of the frame of reference. Comments: Only by mastering the concept of frame of reference can such problems be successfully solved, so it is necessary to strengthen the understanding and mastery of basic concepts.
3. There is a poem "Looking at the sky and clouds, I don't know that the ship and I are both east", and the choice is "Clouds and I are both east".
(⊙v⊙) Yeah
The sun, a little unreasonable, because the sun is also moving, and the width is completely different.
But the problem is that the dike should be ok.
1, the ship and I are relatively stationary, and the clouds are in my east, which means that the movement is eastward. So relative to the embankment, like relative to the ground, because the embankment and the ground are relatively static, there is no doubt that both B and C are ok.
Multiple-choice questions in physics generally do not stipulate whether they are single or multiple choices, so this question B and C are optional.
I just lay looking at the sky, and I don't know if Yun and I understand each other.
As long as C is right, B must be right!
Since I have studied college physics, please believe me and yourself on this issue.
I never think that books are necessarily right, especially the miscellaneous reference books nowadays.