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What phenomena in life can be explained as spreading along a straight line? (give at least three examples)
① Pinhole imaging
② Solar eclipse / lunar eclipse
③ The formation of shadow
④ The light of a flashlight
We found some
1. At night, use a flashlight to light in a dark place;
2. Sunlight passes through the pores between the leaves, and numerous small dots appear on the ground;
3. In shooting and archery, we use the straight-line propagation of light -- aiming at three points and one straight line;
4. A carpenter uses a planer to plane a strip of wood, and then checks whether the planer is straight or not. He uses the linear propagation of light to judge;
5. If you only see the back of the head of the former person in line, the line is straight
RELATED INFORMATIONS
- 1. For example, some examples in our daily life show that molecules are constantly moving, and there are intervals between molecules
- 2. Starting from the phenomenon of life, two experiments are given to illustrate the motion of liquid molecules
- 3. Can you give us some examples of the benefits of competition
- 4. The (), () of the figure before and after translation are exactly the same
- 5. The two elements of graphic translation are and Completion
- 6. (translational) The following motions are not translational: A. The slip of a car on the ground when it brakes sharply B. The plane accelerated on the runway before taking off C. The movement of a kite in the air D. The cable car movement in the mountains
- 7. The following phenomenon belongs to translation transformation () 1. The rolling of football on the morning ground; 2. The swing of pendulum; 3. The movement of bottled drinks on the conveyor belt
- 8. Strange phenomena in life? It must be based on facts
- 9. Write a composition about the strange landscape formed by nature
- 10. What are the wonders of nature
- 11. Specific application examples of Doppler effect? Please do not be too complicated, simple and practical examples
- 12. Examples of discounts in life
- 13. The up and down movement of elevator is () phenomenon, the rotation of windmill is () phenomenon?
- 14. What is the phenomenon of elevator up and down movement and what is the movement of windmill rotation
- 15. Solve right and wrong math problems 1. If two numbers are composite numbers, their common factor can not be only 1. (right) (wrong)? 2. Number a is a multiple of number B, and the greatest common factor of these two numbers is 1. (right) (wrong)? The greatest common factor of 3.15, 45 and 60 is 15. (right) (wrong)?
- 16. In life, we see many objects moving. How do they move?
- 17. Uncle Zhang is driving on a straight road. What is the movement of the steering wheel Translation or rotation
- 18. Which geometric bodies in our life can be obtained by the rotation of plane figure? What plane figure can they be obtained by rotation? Give an example
- 19. What's the difference between translation and distance
- 20. Are equilateral triangles and squares axisymmetric figures? How many axes do they have